Difference between revisions of "Japanese Ground Vehicle History"

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After World War 1 ended, Japan followed suit to the new development of tanks after their own attempts at mechanizing their cavalry with armoured car experiments, which didn't suit the poor roads and extreme winter conditions in Manchuria. The Japanese Army therefore bought the following vehicles from their then Allied nations to kickstart Japanese tank development; one British Heavy Mk. IV {{Annotation|(Female)|Only armed with MGs as opposed to, Male with cannons}}, several Medium Mk. A "Whippet" and a dozen French Renault "FT"s
+
After World War I ended, Japan, following the new trend of tank development,, sought to mechanize their cavalry after unsuccessful armored car experiments, which were unsuitable for the poor roads and extreme winter conditions in Manchuria. Consequently, the Japanese Army purchased the following vehicles from their then Allied nations to kickstart Japanese tank development: one British Heavy Mk. IV {{Annotation|(Female)|Armed only with machine guns, as opposed to the Male variant with cannons}}, several Medium Mk. A "Whippet," and a dozen French Renault "FT" tanks.
 +
 
 +
With their new tanks fully acquired by 1919, tank studies and research could commence in 1920, with Army command undergoing discussions on how tank usage, doctrine, and organization should be handled. By 1925, the first Japanese tank battalion (later upgraded to the 1st Tank Regiment) was established, along with a new tank school. The structuring of the Japanese tank force primarily relied on a main force of light tanks (<10t), supported by "Heavy" tanks (<20t), with a goal of forming 3 light tank battalions (190 vehicles) and 1 heavy tank battalion (30 vehicles). However, the limited number of imported tanks posed a challenge for ambitious plans to establish a completely new armored tank force. Initially, negotiations were considered for outsourced tanks to save on the costs of designing and producing domestic tanks. The first idea involved approaching the British, but they prioritized upgrading their own army and couldn't afford additional production. The Japanese also dismissed tank designs by the American John W. Christie due to concerns about suspension and track reliability. This led them to consider purchasing more Renault FTs from the French, who were preoccupied with developing their latest tank. This marked the beginning of favoring Japanese domestic tanks over buying technologically obsolete tanks simply to fill ranks. Meanwhile, behind-the-scenes tracked vehicle development was already proving worthwhile.
  
 
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| [[File:Britain_flag.png|32px]] Britain || Mark VIb Tankette, Carden Loyd Tankette || {{Annotation|2+6|2 Army - 6 Navy}} || 1927 || {{Annotation|1930|1930 Army - 1932 Navy}}
 
| [[File:Britain_flag.png|32px]] Britain || Mark VIb Tankette, Carden Loyd Tankette || {{Annotation|2+6|2 Army - 6 Navy}} || 1927 || {{Annotation|1930|1930 Army - 1932 Navy}}
 
|-|}
 
|-|}
 
 
With their new tanks fully acquired by 1919, tank studies and research could commence in 1920 with Army command undergoing discussion how tank usage, doctrine and organization should be handled. By 1925 the first Japanese tank battalion (later upgraded to the 1st Tank Regiment) was established together with a new tank school. The structuring of the Japanese tank force primarily relied around a main force of light tanks (<10t) with the support of "Heavy" tanks at (<20t) and setting its goal of 3 light tank battalion (190 vehicles) and 1 heavy tank battalion (30 vehicles). But with the limited imported tanks for ambitious plans of a whole new armoured tank force would requires more tanks. The first idea was negotiating for a outsourced tank, saving the costs of designing and producing domestic tanks. Starting with the British who prioritized upgrading its own army and could not afford production, with the Japanese dismissing tank designs by the American John W. Christie with concerns for suspension and track reliability left them to consider buying more FTs from the French who were too busy developing their latest tank. This sparked the start of Japanese domestic tanks being favoured over buying technologically obsolete tanks just to fill ranks, with behind the scenes tracked vehicle development was already proving worthwhile.
 
  
 
{{Notice
 
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|!}}
 
|!}}
 
[[File:GarageImage_Ro-Go.jpg|right|thumb|Type 95 Ro-Go, a later iteration on the fundamental first Japanese design]]
 
[[File:GarageImage_Ro-Go.jpg|right|thumb|Type 95 Ro-Go, a later iteration on the fundamental first Japanese design]]
The Army Technology Headquarters approved the development of a domestic tank, spearheaded by Tomio Hara, a young Japanese officer who after plenty of tank studies and advocation for Japanese tank development would become the father of many Japanese tank designs and principals. His and domestically first Japanese tank eventually resulted into, simply known as, the ''{{Annotation|試製一号戦車|Shisei Ichi Gō-Sensha}} (Prototype Tank No.1)'' which was developed under a tight deadline. With most of the struggles not coming from designing the tank itself, the Japanese industry simply didn't have the tools or manufacturing set-up for tank development, with the Army opting to utilize the [[:Template:TankManufacturer Osaka Arsenal|Osaka Arsenal (State Weapons Factory)]] instead of the then new and fragile Automotive industry which meant all parts had to be precisely crafted with 10,000s of blueprints drawn up for everything together. With the prototype finished by February, 1927, just a month short of its 22 month deadline to March, the tank was tested at famous Fuji training range by June 21. After civilians and military personnel alike watched the First Japanese tank in motion, tests concluded that it was far superior over its Western imports in both handling, firepower and easy operation and established a confidence in domestic tank design.
+
The Army Technology Headquarters approved the development of a domestic tank, spearheaded by Tomio Hara, a young Japanese officer who, after extensive tank studies and advocacy for Japanese tank development, would become the father of many Japanese tank designs and principles. His first domestically produced Japanese tank eventually resulted in what was simply known as the ''{{Annotation|試製一号戦車|Shisei Ichi Gō-Sensha}} (Prototype Tank No.1),'' which was developed under tight deadlines. Most of the challenges did not stem from designing the tank itself; rather, the Japanese industry lacked the necessary tools and manufacturing setup for tank development. The Army opted to utilize the [[:Template:TankManufacturer Osaka Arsenal|Osaka Arsenal (State Weapons Factory)]] instead of the then-new and fragile automotive industry. This meant that all parts had to be precisely crafted, requiring tens of thousands of blueprints for everything. The prototype was completed by February 1927, just a month short of its 22-month deadline to March, and was tested at the famous Fuji training range by June 21. After civilians and military personnel alike witnessed the first Japanese tank in motion, tests concluded that it was far superior to its Western imports in handling, firepower, and ease of operation, but its overall weight and production cost dismissed it from service. This success established confidence in domestic tank design.
  
 
[[File:GarageImage_I-Go_Ko.jpg|left|thumb|Type 89 I-Go, First mass produced Japanese and {{Annotation|diesel powered*|Otsu variant}} tank]]
 
[[File:GarageImage_I-Go_Ko.jpg|left|thumb|Type 89 I-Go, First mass produced Japanese and {{Annotation|diesel powered*|Otsu variant}} tank]]
While the first Japanese tank reinforced the development and research into domestic tanks, the prototype was far too heavy at 18 tonnes at a requested of 12 tonnes, and prompted Tomio back to the drawing board for a lighter main tank at around 10 tonnes, with development inspired by the 1927 British imported Vickers Medium Mk.C <small>(Export Vicker Medium Mk.III, not to be confused with the Medium Mk.C "Hornet")</small>. By 1929 the new I-Go was ready and its first prototype rolled out of Osaka Arsenal, and further mass production was assigned to [[:Template:TankManufacturer_Mitsubishi|Mitsubishi]] [[:Template:AirManufacturer_Mitsubishi|Aircraft]], which would continue to mass-produce most of the Japanese tanks afterwards to this day. By the time of adoption, it would be known as the Type 89 "I-Go" Light Tank, as its prototype only weighed at around 9 ton, and production weighed in at 11.8 ton, this would only change to become the Type 89 "I-Go" Medium Tank after Headquarters reviewed its tank doctrine, added the new role of medium tank instead of just light and heavy, and replaced its light tank role to the Type 95 "Ha-Go" Light Tank.
+
While the first Japanese tank reinforced the development and research into domestic tanks, the prototype was far too heavy at 18 tonnes, exceeding the requested weight of 12 tonnes. This prompted Tomio to return to the drawing board for a lighter main tank, aiming for around 10 tonnes. Development was inspired by the 1927 British-imported Vickers Medium Mk.C <small>(Export Vicker Medium Mk.III, not to be confused with the Medium Mk.C "Hornet")</small>. By 1929, the new I-Go was ready, and its first prototype rolled out of Osaka Arsenal. Further mass production was assigned to [[:Template:TankManufacturer_Mitsubishi|Mitsubishi]] [[:Template:AirManufacturer_Mitsubishi|Aircraft]], which would continue to mass-produce most of the Japanese tanks thereafter. By the time of adoption, it would be known as the Type 89 "I-Go" Light Tank. Its prototype weighed only around 9 tons, while production models weighed in at 11.8 tons. This designation later changed to become the Type 89 "I-Go" Medium Tank after Headquarters reviewed its tank doctrine, adding the new role of medium tank instead of just light and heavy. The light tank role was then replaced by the Type 95 "Ha-Go" Light Tank.
  
While production of Japan's new main-line tank just started, the Army still decided to buy more Western tanks to bolster and replace older models while also learning out of the newest advances their Western counterparts were making in 1930, Buying multiple Renault "NC"s from France, and several British Carden Loyd tankettes and Vickers 6-Ton tanks. The tankette was, like multi turreted designs, a venture the Japanese felt was a required branch of tank that had to be developed and researched, with multiple attempts at building tankettes ranging from the earliest Type 92 cavalry tank (and its amphibious prototypes) and Type 94 tankette, finding mobility a nice feature in-combat and scouting but lacking any serious use case due to the limited firepower and limited upgrade possibility of a MG armed tank. The latter Type 94 tankette also featured and introduced Tomio Hara's bell crank scissors suspension which would be the de facto suspension of all following Japanese tanks as it proved very successful for off-road operations and reducing overall maintenance cost.
+
While production of Japan's new main-line tank had just begun, the Army decided to acquire more Western tanks to bolster and replace older models, as well as to learn from the latest advances made by their Western counterparts in 1930. They purchased multiple Renault "NC" tanks from France, along with several British Carden Loyd tankettes and Vickers 6-Ton tanks. The tankette, much like multi-turreted designs, was considered by the Japanese as a necessary branch of tank that required development and research. There were multiple attempts at building tankettes, ranging from the earliest Type 92 cavalry tank (and its amphibious prototypes) to the Type 94 tankette. While mobility was appreciated for combat and scouting purposes, tankettes were deemed lacking in serious firepower and upgrade potential, being armed only with machine guns. The latter Type 94 tankette also introduced Tomio Hara's bell crank scissors suspension, which became the standard suspension system for all subsequent Japanese tanks. It proved highly successful for off-road operations and helped reduce overall maintenance costs.
  
 
[[File:GarageImage_Ha-Go.jpg|right|thumb|Type 95 Ha-Go, Japan's most numerous produced tank]]
 
[[File:GarageImage_Ha-Go.jpg|right|thumb|Type 95 Ha-Go, Japan's most numerous produced tank]]
With the early-mid 1930s rolling by, Japan uses its newly established tank forces in Manchuria and Chinese border skirmish battles, proving the values of Japanese tanks. Though the advancements in the automotive industry increased the mobility of mechanized infantry units, averaging 40 km/h divisional speed, kept the heavier and slow I-Go behind which maxed out at 25 km/h, and that staggered down to 12 - 8 km/h off-road, which for frontline movement under infantry marches was good enough. With the Japanese focus on light tanks as a main force and an increasing max speed for mobility, the 1928 I-Go design started falling behind for the mid 30s and a replacement was in-order. With the previous imported British tanks and tankettes and Japanese attempts at making tankettes, resulted into the new main tank of the Japanese Army, the Type 95 "Ha-Go" Light Tank. Development of the Ha-Go started even before the replacement of the I-Go was requested, with the original request coming from the Kwantung Army to devise an experimental mechanized unit (would become "1st Mixed Brigade") to the then Mitsubishi Aircraft, making this the first tank based on a prototype of a private company.  
+
As the early-mid 1930s rolled by, Japan employed its newly established tank forces in Manchuria and skirmishes along the Chinese border, showcasing the value of Japanese tanks. However, despite advancements in the automotive industry that increased the mobility of mechanized infantry units, with an average divisional speed of 40 km/h, the heavier and slower I-Go lagged behind, reaching a maximum speed of only 25 km/h, which further decreased to 12-8 km/h off-road. Although, for frontline movement under infantry marches, this speed was deemed sufficient. With Japan's emphasis on light tanks as the main force and a growing need for higher mobility, the design of the 1928 I-Go began to fall short by the mid-1930s, necessitating a replacement.
 +
 
 +
Previous imports of British tanks and tankettes, along with Japanese attempts to produce tankettes, culminated in the development of the new main tank for the Japanese Army: the Type 95 "Ha-Go" Light Tank. Development of the Ha-Go began even before the need for the I-Go's replacement was acknowledged. The original request for its development came from the Kwantung Army, aiming to devise an experimental mechanized unit (which would become the "1st Mixed Brigade") to Mitsubishi Aircraft. This marked the first instance of a tank being based on a prototype from a private company.
 
{{Break}}
 
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ArtImage_Type_94.jpg|[[Type 94|Type 94 (20 mm Type 98)]], 1938
 
ArtImage_Type_94.jpg|[[Type 94|Type 94 (20 mm Type 98)]], 1938
 
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With Japanese tank development continuing and tank reports coming back from frontline border skirmishes, by 1936 a new infantry support tank was requested as the I-Go, while modestly successful at the front, was too slow for Japanese liking. The new tank program was to suit the role of medium tank, supporting infantry and the main force of [[Ha-Go]]s, improvements were requested towards armour, taking in account body construction and penetration defense (i.e. angled armour) and primarily increasing the speed so it keeps up with both infantry and light tanks. The diesel engine the Japanese put in their previous tanks since the I-Go Otsu model, has proved as a necessity as the fuel used was easier to obtain than gasoline, less volatile and flammable, alternative ways to procure diesel out of oil shale and even Soybeans and the Manchurian battlefield conditions that were taken into account in extreme colds were more ideal air-cooled diesel to prevent the need of restocking or freezing coolant which only downsided in requiring a larger air-cooled diesel engine to obtain the same output as a gasoline engine. So the biggest concern was an increase in weight while keeping the diesel engine, resulting in an increase in material cost, with mixed opinions on investing more cost for more performance or saving weight and cost at the cost of survivability and speed, which resulted into two branching prototypes based on both concepts. The Army Technical Headquarters devised both concepts under Plan A (甲 , Kō) and B (乙 , Otsu) resulting as planned with:
+
With Japanese tank development ongoing and reports returning from frontline border skirmishes, by 1936, a new infantry support tank was requested. While the I-Go, though modestly successful at the front, was deemed too slow for Japanese preferences. The new tank program aimed to fulfill the role of a medium tank, supporting infantry alongside the main force of Ha-Gos. Improvements were sought in armor, considering body construction and penetration defense (such as angled armor), and primarily focusing on increasing speed to ensure it could keep pace with both motorized infantry and light tanks.
 +
 
 +
The decision to use diesel engines in previous tanks, starting with the I-Go Otsu model, had proven necessary due to the ease of obtaining diesel fuel compared to gasoline. Diesel was less volatile and flammable, and alternative methods of procuring diesel from oil shale and even soybeans were considered. Additionally, the extreme cold conditions of the Manchurian battlefield favored air-cooled diesel engines to prevent the need for restocking or freezing coolant. However, this required larger air-cooled diesel engines to achieve the same output as gasoline engines, raising concerns about increased weight and material costs.
 +
 
 +
Mixed opinions emerged regarding whether to invest more in cost for better performance or to prioritize saving weight and cost, even if it compromised survivability and speed. This dilemma led to the development of two branching prototypes based on both concepts. The Army Technical Headquarters devised both concepts under Plan A (甲 , Kō) and Plan B (乙 , Otsu), resulting in:
  
 
  Plan A - More Expensive:
 
  Plan A - More Expensive:
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   1 machine gun (1 hull, removed out of the turret)
 
   1 machine gun (1 hull, removed out of the turret)
  
The Imperial Japanese Army General Staff Office requested Plan A to be reduced to 12 tons, which the Technical Headquarters couldn't comply with as the prototype hit 15 tons, resulting in the idea to mass deploy Plan B to make up for the performance difference by using the "saved" cost. Though out of the Tank school's opinion the 2 manned turret is an absolute and essential advantage over a 1 manned turret even if the alternative vehicle has acceptable speed and armour. With neither concepts being able to find a compromise, this possibly resulted in a third prototype development (unrelated to the initial order), which was later known as the "Type 98 Chi-Ho medium tank".
+
The Imperial Japanese Army General Staff Office requested that Plan A be reduced to 12 tons, but the Technical Headquarters couldn't comply as the prototype reached 15 tons. This led to the idea of mass deploying Plan B to compensate for the performance difference using the "saved" cost. Despite the Tank School's opinion that the two-man turret provided an absolute and essential advantage over a one-man turret, even if the alternative vehicle had acceptable speed and armor, neither concept could find a compromise. This possibly resulted in the development of a third prototype (unrelated to the initial order), later known as the "Type 98 Chi-Ho medium tank."
  
 
{{Notice|Japanese Tank Doctrine into the 30s:
 
{{Notice|Japanese Tank Doctrine into the 30s:
With all nations during the interwar conflicting over an infantry based tank force or independent tank unit for a combined arms doctrine, the Japanese had effectively used combined arms tactics in 1933 during the battle of Rehe, which saw the use of mechanized infantry with Type 89s "I-Go" overtake the retreating Chinese troops to the capital of Rehe, Chengde. Other instances of combined arms tactics also occurred but were ignored by Hideki Tojo who favoured an infantry centered attack with spread out armour support. This change in tactic favoured very poorly at Chinese defenses with proper anti-tank defenses against thinly spread tanks and reduced the importance of Japanese tank funding.}}
+
During this period, there was a debate among nations about whether to prioritize infantry-based tank forces or independent tank units for combined arms strategies. In 1933, Japan demonstrated effective combined arms tactics during the Battle of Rehe, utilizing mechanized infantry alongside I-Go tanks which swiftly overtook retreating Chinese troops and reached the capital of Rehe, Chengde. Even with other successful examples, Minister of War Hideki Tojo favored an infantry-centered approach with dispersed armor support, which proved ineffective against both Chinese anti-tank defenses and Soviet tanks during the Khalkhin Gol battles. This shift in tactics diminished the importance of Japanese tank funding.}}
  
 
[[File:GarageImage_Chi-Ha.jpg|left|thumb|Type 97 Chi-Ha, Japan's main medium tank]]
 
[[File:GarageImage_Chi-Ha.jpg|left|thumb|Type 97 Chi-Ha, Japan's main medium tank]]
With the Second Sino-Japanese war kicking into a full-blown war, Military funding increased drastically which tipped the balance of favour for Plan A, being now put in service as the Type 97 "Chi-Ha" Medium Tank, resulting in the Plan B "Chi-Ni" to be left behind with its singular prototype built. The Chi-Ha was also the first Japanese tank to be default equipped with radio equipment, which the previous I-Go and Ha-Go only started experimenting with around 1937 as radio equipment got smaller, relying on signal flags before that and specialized command variants of tanks being the sole vehicles with radios equipped.  
+
With the Second Sino-Japanese War escalating into a full-blown conflict, military funding increased drastically, tipping the balance in favor of Plan A. This led to Plan A being put into service as the Type 97 "Chi-Ha" Medium Tank, while the Plan B "Chi-Ni" was left behind with only a singular prototype built. The Chi-Ha was also notable as the first Japanese tank to be equipped with radio equipment by default. Previous models like the I-Go and Ha-Go had only begun experimenting with radio equipment around 1937 as technology advanced and equipment became smaller. Before this, tanks relied on signal flags, with specialized command variants being the only vehicles equipped with radios.
 
{{Break}}
 
{{Break}}
  
 
[[File:GarageImage_Type_94.jpg|right|thumb|Type 94 Truck, Equipped with a 20 mm Type 98 Anti-Air Gun]]
 
[[File:GarageImage_Type_94.jpg|right|thumb|Type 94 Truck, Equipped with a 20 mm Type 98 Anti-Air Gun]]
The start of the war also showcased the developments of the sky in ground combat, deeming machine guns as insufficient as anti-air defense against constantly increasing air speed and defense and the response time of towed anti-air in convoys was too slow, so the quickest response for defending moving units in movement was equipping the standard Japanese truck with the gun it was towing, which became the standard Japanese self propelled anti-air for the remainder of the war. Development of self-propelled anti-air didn't stop here however and moved first towards half-tracks before being developed onto full tracked tanks. With initial prototypes developing off the Type 97 Te-Ke light tank into the experimental Ki-To self propelled anti-air, developing further on the following Type 98 Ke-Ni light tank towards the experimental [[Ta-Se]] and [[So-Ki]].
+
The onset of the war also highlighted the need for advancements in ground-to-air combat. Machine guns were deemed insufficient as anti-air defense due to the increasing speed and capabilities of aircraft. Towed anti-aircraft defenses in convoys also suffered from slow response times. As a result, the quickest solution for defending moving units was to equip standard Japanese trucks with the guns they were towing, leading to the standardization of Japanese self-propelled anti-aircraft vehicles for the remainder of the war. However, development of self-propelled anti-aircraft vehicles didn't end there. It initially progressed to half-tracks before advancing to full-tracked tanks. Initial prototypes were based on the Type 97 Te-Ke light tank and evolved into the experimental Ki-To self-propelled anti-aircraft vehicle. Further development occurred with the following Type 98 Ke-Ni light tank, leading to experimental vehicles such as the [[Ta-Se]] and [[So-Ki]].
 
{{Break}}
 
{{Break}}
  
 
[[File:GarageImage_Ke-Ni.jpg|left|thumb|Type 98 Ke-Ni, The planned replacement of the Ha-Go]]
 
[[File:GarageImage_Ke-Ni.jpg|left|thumb|Type 98 Ke-Ni, The planned replacement of the Ha-Go]]
The increased budget of the war also meant the possibility of upgrading the main force of the Japanese tank's army, with plenty of upgrades taken into development, welding the armour together instead of rivets, increasing its armour thickness and taking a more rounded armour to increase the bouncing of shells and the lower profile also meant more weight saved while still increasing speed. The main turret which was also rounded out, was increased to 2 manned as well after eliminating the hull mounted machine gun and instead mounting it to the side of the main gun. While the Ke-Ni was superior over the Ha-Go in every regard, the Japanese Army still prioritized the manufactory of the Ha-Go as it proved itself on the battlefield, sufficient reliability and the differences in performance weren't decisive enough.
+
The increased wartime budget opened up possibilities for upgrading the mainstay of the Japanese tank army. Numerous upgrades were developed, including welding the armor instead of using rivets, increasing its thickness, and adopting a more rounded shape to enhance shell deflection. This streamlined profile also saved weight while boosting speed. Additionally, the main turret, also rounded, transitioned to a two-man crew configuration after removing the hull-mounted machine gun and mounting it beside the main gun. Despite the Ke-Ni's superiority over the Ha-Go in various aspects, the Japanese Army continued to prioritize the production of the Ha-Go due to its battlefield effectiveness, reliability, and the performance differences not being decisive enough.
 
{{Break}}
 
{{Break}}
  

Revision as of 17:08, 17 April 2024

Icons Write.pngWriting in process...
This article is being edited by the member Shimakaze (talk) 01:22, 15 April 2024 (UTC) (start date). Other participants are requested to not make any changes while this warning is here.
General proofreading, editing and information additions are fine by me, removal is discouraged. --Shimakaze (talk)

Historic Overview

Main article: Japanese tank naming

Interwar

After World War I ended, Japan, following the new trend of tank development,, sought to mechanize their cavalry after unsuccessful armored car experiments, which were unsuitable for the poor roads and extreme winter conditions in Manchuria. Consequently, the Japanese Army purchased the following vehicles from their then Allied nations to kickstart Japanese tank development: one British Heavy Mk. IV (Female), several Medium Mk. A "Whippet," and a dozen French Renault "FT" tanks.

With their new tanks fully acquired by 1919, tank studies and research could commence in 1920, with Army command undergoing discussions on how tank usage, doctrine, and organization should be handled. By 1925, the first Japanese tank battalion (later upgraded to the 1st Tank Regiment) was established, along with a new tank school. The structuring of the Japanese tank force primarily relied on a main force of light tanks (<10t), supported by "Heavy" tanks (<20t), with a goal of forming 3 light tank battalions (190 vehicles) and 1 heavy tank battalion (30 vehicles). However, the limited number of imported tanks posed a challenge for ambitious plans to establish a completely new armored tank force. Initially, negotiations were considered for outsourced tanks to save on the costs of designing and producing domestic tanks. The first idea involved approaching the British, but they prioritized upgrading their own army and couldn't afford additional production. The Japanese also dismissed tank designs by the American John W. Christie due to concerns about suspension and track reliability. This led them to consider purchasing more Renault FTs from the French, who were preoccupied with developing their latest tank. This marked the beginning of favoring Japanese domestic tanks over buying technologically obsolete tanks simply to fill ranks. Meanwhile, behind-the-scenes tracked vehicle development was already proving worthwhile.

Imported tanks (1917-1930)
Origin Vehicle Amount Year
Developed
Japanese
Introduction
Britain flag.png Britain Mark IV Heavy Tank 1 1917 1918
Britain flag.png Britain Mark A Medium Tank, Whippet 3-6* 1917 1919
France flag.png France Renault "FT" Light Tank 20* 1917 1919
France flag.png France Saint-Chamond mod. 1921 1 1921 1924
Britain flag.png Britain Mark C Medium Tank, Vickers Mk III 1 1921 1927
Italy flag.png Italy Fiat 3000 2 1921 1928
France flag.png France Renault "NC" Light Tank 23 1927 1930
Britain flag.png Britain Mark E Light Tank, Vickers 6 ton 1 1928 1930
Britain flag.png Britain Mark VIb Tankette, Carden Loyd Tankette 2+6 1927 1930
Msg-important.png Editorial Note About "Chi-I" (Prototype No.1) and "Chi-Ro" (I-Go):

While internally these vehicles were retroactively counted into the Japanese IRoHa tank naming (chi-I, chi-RO, chi-HA, ...) these never were actually referred to as Chi-I and Chi-Ro.

Prototype No.1 & No.2 (Type 91 Heavy) were never adopted for service, and never got a "proper name / designation", the I-Go was the first adopted tank and was named under the short lived "X-Go" naming, also going of the IRoHa, with the scheme simply translating to "Xth - Tank":

I-go = 1st Tank, RO-go = 2nd Tank, HA-go = 3rd Tank

Some sources even suggest that the "I-Go Ko" & "I-Go Otsu" were internalized as "Chi-I" and "Chi-Ro" respectively, others mention I-Go and Ro-Go as "Chi-I" and "Chi-Ro" as these were the first 2 adopted tanks of the heavy/medium category.

Type 95 Ro-Go, a later iteration on the fundamental first Japanese design

The Army Technology Headquarters approved the development of a domestic tank, spearheaded by Tomio Hara, a young Japanese officer who, after extensive tank studies and advocacy for Japanese tank development, would become the father of many Japanese tank designs and principles. His first domestically produced Japanese tank eventually resulted in what was simply known as the 試製一号戦車 (Prototype Tank No.1), which was developed under tight deadlines. Most of the challenges did not stem from designing the tank itself; rather, the Japanese industry lacked the necessary tools and manufacturing setup for tank development. The Army opted to utilize the Osaka Arsenal (State Weapons Factory) instead of the then-new and fragile automotive industry. This meant that all parts had to be precisely crafted, requiring tens of thousands of blueprints for everything. The prototype was completed by February 1927, just a month short of its 22-month deadline to March, and was tested at the famous Fuji training range by June 21. After civilians and military personnel alike witnessed the first Japanese tank in motion, tests concluded that it was far superior to its Western imports in handling, firepower, and ease of operation, but its overall weight and production cost dismissed it from service. This success established confidence in domestic tank design.

Type 89 I-Go, First mass produced Japanese and diesel powered* tank

While the first Japanese tank reinforced the development and research into domestic tanks, the prototype was far too heavy at 18 tonnes, exceeding the requested weight of 12 tonnes. This prompted Tomio to return to the drawing board for a lighter main tank, aiming for around 10 tonnes. Development was inspired by the 1927 British-imported Vickers Medium Mk.C (Export Vicker Medium Mk.III, not to be confused with the Medium Mk.C "Hornet"). By 1929, the new I-Go was ready, and its first prototype rolled out of Osaka Arsenal. Further mass production was assigned to Mitsubishi Aircraft, which would continue to mass-produce most of the Japanese tanks thereafter. By the time of adoption, it would be known as the Type 89 "I-Go" Light Tank. Its prototype weighed only around 9 tons, while production models weighed in at 11.8 tons. This designation later changed to become the Type 89 "I-Go" Medium Tank after Headquarters reviewed its tank doctrine, adding the new role of medium tank instead of just light and heavy. The light tank role was then replaced by the Type 95 "Ha-Go" Light Tank.

While production of Japan's new main-line tank had just begun, the Army decided to acquire more Western tanks to bolster and replace older models, as well as to learn from the latest advances made by their Western counterparts in 1930. They purchased multiple Renault "NC" tanks from France, along with several British Carden Loyd tankettes and Vickers 6-Ton tanks. The tankette, much like multi-turreted designs, was considered by the Japanese as a necessary branch of tank that required development and research. There were multiple attempts at building tankettes, ranging from the earliest Type 92 cavalry tank (and its amphibious prototypes) to the Type 94 tankette. While mobility was appreciated for combat and scouting purposes, tankettes were deemed lacking in serious firepower and upgrade potential, being armed only with machine guns. The latter Type 94 tankette also introduced Tomio Hara's bell crank scissors suspension, which became the standard suspension system for all subsequent Japanese tanks. It proved highly successful for off-road operations and helped reduce overall maintenance costs.

Type 95 Ha-Go, Japan's most numerous produced tank

As the early-mid 1930s rolled by, Japan employed its newly established tank forces in Manchuria and skirmishes along the Chinese border, showcasing the value of Japanese tanks. However, despite advancements in the automotive industry that increased the mobility of mechanized infantry units, with an average divisional speed of 40 km/h, the heavier and slower I-Go lagged behind, reaching a maximum speed of only 25 km/h, which further decreased to 12-8 km/h off-road. Although, for frontline movement under infantry marches, this speed was deemed sufficient. With Japan's emphasis on light tanks as the main force and a growing need for higher mobility, the design of the 1928 I-Go began to fall short by the mid-1930s, necessitating a replacement.

Previous imports of British tanks and tankettes, along with Japanese attempts to produce tankettes, culminated in the development of the new main tank for the Japanese Army: the Type 95 "Ha-Go" Light Tank. Development of the Ha-Go began even before the need for the I-Go's replacement was acknowledged. The original request for its development came from the Kwantung Army, aiming to devise an experimental mechanized unit (which would become the "1st Mixed Brigade") to Mitsubishi Aircraft. This marked the first instance of a tank being based on a prototype from a private company.

Msg-info.png Japanese Machine Gun Doctrine:

While it may seem odd why Japanese tank machine guns are standard infantry magazine fed, this was a deliberate choice taking into account the Japanese doctrine around automatic machine guns, preferring a more accurate and long range engagement on the machine gun, it was heavily implied that every shot counted and that it wasn't simply for suppressing enemy targets as every bullet was meant to hit. This would in theory save cost and bullets, and the additional benefit of reducing logistical strains by taking standard infantry ready munitions.

Second Sino-Japanese War

With Japanese tank development ongoing and reports returning from frontline border skirmishes, by 1936, a new infantry support tank was requested. While the I-Go, though modestly successful at the front, was deemed too slow for Japanese preferences. The new tank program aimed to fulfill the role of a medium tank, supporting infantry alongside the main force of Ha-Gos. Improvements were sought in armor, considering body construction and penetration defense (such as angled armor), and primarily focusing on increasing speed to ensure it could keep pace with both motorized infantry and light tanks.

The decision to use diesel engines in previous tanks, starting with the I-Go Otsu model, had proven necessary due to the ease of obtaining diesel fuel compared to gasoline. Diesel was less volatile and flammable, and alternative methods of procuring diesel from oil shale and even soybeans were considered. Additionally, the extreme cold conditions of the Manchurian battlefield favored air-cooled diesel engines to prevent the need for restocking or freezing coolant. However, this required larger air-cooled diesel engines to achieve the same output as gasoline engines, raising concerns about increased weight and material costs.

Mixed opinions emerged regarding whether to invest more in cost for better performance or to prioritize saving weight and cost, even if it compromised survivability and speed. This dilemma led to the development of two branching prototypes based on both concepts. The Army Technical Headquarters devised both concepts under Plan A (甲 , Kō) and Plan B (乙 , Otsu), resulting in:

Plan A - More Expensive:
  13.5 tons
  2 manned turret
  2 machine guns (1 hull, 1 rear-side turret)
  Roughly same crew compartment size as the I-Go
Plan B - Cheap Alternative:
  10 tons
  1 manned turret
  1 machine gun (1 hull, removed out of the turret)

The Imperial Japanese Army General Staff Office requested that Plan A be reduced to 12 tons, but the Technical Headquarters couldn't comply as the prototype reached 15 tons. This led to the idea of mass deploying Plan B to compensate for the performance difference using the "saved" cost. Despite the Tank School's opinion that the two-man turret provided an absolute and essential advantage over a one-man turret, even if the alternative vehicle had acceptable speed and armor, neither concept could find a compromise. This possibly resulted in the development of a third prototype (unrelated to the initial order), later known as the "Type 98 Chi-Ho medium tank."

Msg-info.png Japanese Tank Doctrine into the 30s:

During this period, there was a debate among nations about whether to prioritize infantry-based tank forces or independent tank units for combined arms strategies. In 1933, Japan demonstrated effective combined arms tactics during the Battle of Rehe, utilizing mechanized infantry alongside I-Go tanks which swiftly overtook retreating Chinese troops and reached the capital of Rehe, Chengde. Even with other successful examples, Minister of War Hideki Tojo favored an infantry-centered approach with dispersed armor support, which proved ineffective against both Chinese anti-tank defenses and Soviet tanks during the Khalkhin Gol battles. This shift in tactics diminished the importance of Japanese tank funding.

Type 97 Chi-Ha, Japan's main medium tank

With the Second Sino-Japanese War escalating into a full-blown conflict, military funding increased drastically, tipping the balance in favor of Plan A. This led to Plan A being put into service as the Type 97 "Chi-Ha" Medium Tank, while the Plan B "Chi-Ni" was left behind with only a singular prototype built. The Chi-Ha was also notable as the first Japanese tank to be equipped with radio equipment by default. Previous models like the I-Go and Ha-Go had only begun experimenting with radio equipment around 1937 as technology advanced and equipment became smaller. Before this, tanks relied on signal flags, with specialized command variants being the only vehicles equipped with radios.

Type 94 Truck, Equipped with a 20 mm Type 98 Anti-Air Gun

The onset of the war also highlighted the need for advancements in ground-to-air combat. Machine guns were deemed insufficient as anti-air defense due to the increasing speed and capabilities of aircraft. Towed anti-aircraft defenses in convoys also suffered from slow response times. As a result, the quickest solution for defending moving units was to equip standard Japanese trucks with the guns they were towing, leading to the standardization of Japanese self-propelled anti-aircraft vehicles for the remainder of the war. However, development of self-propelled anti-aircraft vehicles didn't end there. It initially progressed to half-tracks before advancing to full-tracked tanks. Initial prototypes were based on the Type 97 Te-Ke light tank and evolved into the experimental Ki-To self-propelled anti-aircraft vehicle. Further development occurred with the following Type 98 Ke-Ni light tank, leading to experimental vehicles such as the Ta-Se and So-Ki.

Type 98 Ke-Ni, The planned replacement of the Ha-Go

The increased wartime budget opened up possibilities for upgrading the mainstay of the Japanese tank army. Numerous upgrades were developed, including welding the armor instead of using rivets, increasing its thickness, and adopting a more rounded shape to enhance shell deflection. This streamlined profile also saved weight while boosting speed. Additionally, the main turret, also rounded, transitioned to a two-man crew configuration after removing the hull-mounted machine gun and mounting it beside the main gun. Despite the Ke-Ni's superiority over the Ha-Go in various aspects, the Japanese Army continued to prioritize the production of the Ha-Go due to its battlefield effectiveness, reliability, and the performance differences not being decisive enough.

Battles of Khalkhin Gol

Msg-info.png Japanese Political War Doctrines:

Japan's path to war was marked by intense interservice rivalry and doctrinal clashes. The main doctrines, Northern and Southern Expansion, respectively focused on expanding into Northern Asia against Russia/USSR (Army-supported) and into Southeast Asia and the Pacific (Navy-supported). For the Southern expansion, Army factions favored counterclockwise expansion (Island hopping), while Navy factions supported clockwise expansion (Claiming naval dominance).

The last pivotal point in Japanese war policy occurred after the battles of Khalkhin Gol, stemming from border disputes with Soviet-Mongolia. These skirmishes escalated into a larger conflict, pitting Japanese units against Soviet troops. The Soviet Union's effective use of tanks, notably the BT series, underscored the significance of armored warfare. Meanwhile, Japan, relying on infantry support tanks like the Ha-Go and Chi-Ha, lacked adequate anti-tank capabilities, proving detrimental in countering Soviet armored assaults. These battles resulted in a significant defeat for Japan and a victory for the Soviet Union, leading to the signing of a ceasefire agreement and solidifying Soviet influence in the region. This prompted Japan to reevaluate its military standing.

The escalation of conflict at Khalkhin Gol occurred primarily due to actions by the Kwantung Army, without governmental authorization. Following the defeat, the signing of the Neutrality Pact, and the replacement and eventual purge of the largest supporters of the doctrine (Kōdōha faction), further attempts at the Northern Expansion Doctrine were disfavored. Priority and funds shifted to the Navy, and reforms within the Japanese army led to an increase in tank production from 500 to 1,200 annually. Additionally, a mechanized headquarters was established, returning Japanese tanks to a combined arms-focused development. This included the introduction of the Type 1 (47 mm) tank gun in response to the Soviet 20-K (45 mm).

World War II

Japanese Offensive
Japanese Defensive

Japanese Navy

Cold War

NPR / NSF

JSDF

Modern Day

See also