A13 Mk I

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Tank, Cruiser, Mk III (A13)
General characteristics
4 peopleCrew
93 %Visibility
front / side / backArmour
14 / 14 / 14Hull
14 / 14 / 14Turret
13.8 tWeight
649 hp340 hpEngine power
47 hp/t24.6 hp/tPower-to-weight ratio
54 km/h forward
7 km/h back
48 km/h forward
6 km/h back
40 mm QF 2-pounder cannonMain weapon
87 roundsAmmunition
2.8 / 3.6 sReload
-15° / 20°Vertical guidance
7.7 mm Vickers machine gunCoaxial weapon
3500 roundsAmmunition
8 / 10.4 sReload
250 roundsBelt capacity
390 shots/minFire rate
0 Sl icon.pngCrew training
1000 Sl icon.pngExperts
10 Ge icon.pngAces
100 % Rp icon.pngReward for battle
10 % Sl icon.png10 % Sl icon.png10 % Sl icon.png
This page is about the British light tank A13 Mk I. For other uses, see A13 (Family).


GarageImage A13MkI.jpg

The Tank, Cruiser, Mk III (A13) is a reserve British light tank with a battle rating of 1.0 (AB/RB/SB). It was introduced along with the initial British tree line in Update 1.55 "Royal Armour".

This tank is a good representative of later rank 2-3 British tanks: good mobility, flat and thin frontal armour, bad reverse speed and minimal post-penetration damage.


Even though the A13 has good mobility, it sometimes feels weird: it loses speed on turns, does not accelerates quite as fast as its overpowered engine (38.19 HP/ton, stock) should provide it and hill-climbing feels hard. All of these flaws come from the gearbox, which has bad and uneven ratios, resulting in a kick when changing speed. Knowing that you should always keep an eye on the "gear" counter top-left of your screen (activate it in the options menu) since it provides you crucial information on how your tank will react to your commands. With a bit of practice, one should swiftly masters these peculiarities.


Since the 40 mm QF 2-pounder is used on most British tanks of rank I, it's important to know it well. This cannon has a major disadvantage at a distance since its projectiles lose around 20 mm of penetration for every 500 m they travels. As if this was not enough, it has poor accuracy. Even with the adjustment of fire modification, one should target large components (crew, engine, transmission) or, as distance increases (500 m or more), the general centre of the foe. Firing it, you will easily notice its last but not least flaw: it does almost no post-penetration damage, which means you will need to snipe, crew members, one by one. Combine this difficulty with a bit of distance and this task can prove difficult, sometimes leaving the enemy enough time to replenish their crew before you finish it off.

On the other hand, this cannon has 5 major advantages: reload speed, close-quarter penetration, a primitive stabilizing system, lots of ammo and awesome gun depression. Its fast reloading speed allows you to compensate for its poor accuracy. Missed a shot? Why not take another even before you can re-position! Close quarter penetration, one of the best at its tier, is also a plus. Your enemies will only block your shot if you happen to hit a steep-angled plate of armour. The primitive stabilizer allows the tank to fire on the move as well. That being said, it works best at low speeds and on the relatively flat road through but is still much more precise than the comparable BT-7 with its 20-K. Last but not least, small shells means more shells. The A13 can bring up to 87 shells into the game, much more than you need to knock out 3-4 tanks. This allows you to try and suppress an enemy and keep it into cover by constantly firing near it (at this rank, this tactic can prove effective against new players). Finally, its good gun depression enables it to fire over hills, exposing only its a small turret, shooting and disappearing swiftly. Proper use of these features allows this tank to compete well at its BR.


Since the addition of smoke in War Thunder, light tanks have it easier. Use your forward-launching smoke to create a wall of smoke in a strategic place. It can be used to cover your allies, when capturing a point, flanking in a street (urban environment).

General info

A13 Mk I on Jungle

Survivability and armour

Armour type:

  • Rolled homogeneous armour
  • Cast homogeneous armour (Gun mantlet)
Armour Front Sides Rear Roof
Hull 14 mm Front plate
14 mm (0-62°) Front glacis
14 mm (64°) Lower glacis
7 + 7 mm 14 mm (0-62°) 14 mm
Turret 14 mm (0-15°) Turret front
14 mm (1-63°) Gun mantlet
14 mm (21°) 14 mm (2°) 14 mm
Armour Sides Roof
Cupola 14 mm 14 mm


A13 Mk I on Jungle
  • Suspension wheels and tracks are 15 mm thick while the torsion bars in between the side armour are 10 mm thick.


Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 54 7 13.8 527 649 38.19 47.03
Realistic 48 6 301 340 21.81 24.64


Main armament

Main article: QF 2-pounder (40 mm)
40 mm QF 2-pounder Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 87 -15°/+20° ±180° Vertical 15.23 21.08 25.60 28.31 30.12 3.64 3.22 2.97 2.80
Realistic 9.52 11.20 13.60 15.04 16.00


Penetration statistics
Ammunition Type of
Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
Shot Mk.1 AP/T AP 72 68 52 37 27 19
Shot Mk.IXB APCBC/T APCBC 89 86 77 66 57 50
Shot Mk.1 APHV/T AP 80 75 58 41 30 21
Shell Mk.1 AP/T APHE 66 62 49 36 26 20
Shell details
Ammunition Type of
Mass (kg)
Fuse delay
Fuse sensitivity
Explosive Mass
(TNT equivalent) (g)
0% 50% 100%
Shot Mk.1 AP/T AP 792 1.08 N/A N/A N/A 47° 60° 65°
Shot Mk.IXB APCBC/T APCBC 792 1.24 N/A N/A N/A 48° 63° 71°
Shot Mk.1 APHV/T AP 853 1.08 N/A N/A N/A 47° 60° 65°
Shell Mk.1 AP/T APHE 792 1.08 1.2 9 20.9 47° 60° 65°

Ammo racks

rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
87 78 (+9) 75 (+12) 72 (+15) 69 (+18) 66 (+21) 62 (+25) 60 (+27) 56 (+31) 51 (+36) 47 (+40) 43 (+44) 41 (+46) 36 (+51) 31 (+56) 16 (+71) (+86) No
Ammo racks of the A13 Mk I

Center hull empty: 41 (+46)


A13 Mk I Optics
Which ones Default magnification Maximum magnification
Main Gun optics x1.85 x3.5
Comparable optics AMR.35 ZT3

Machine guns

Main article: Vickers (7.7 mm)
7.7 mm Vickers
Mount Capacity (Belt) Fire rate Vertical Horizontal
Coaxial 3,500 (250) 390 N/A N/A

Usage in battles

A13 Mk I on Jungle

This vehicle's role is that of a light tank in the truest sense, sporting an acceptable gun, great mobility and virtually no armour to speak of.

This tank has a very active playstyle and should not be used in the front lines. Instead, use your mobility to your advantage: Spot, flank and provide artillery support for your teammates, blind your enemies with well-placed smokes screens in key avenues. Make sure to only target secluded enemies in flanking tactics so you can take full advantage of the element of surprise and outflank your opponent. Never expose yourself for too long because even anti-aircraft guns are a potential threat to your non-angled armour. The QF 2-pounder has an awfully long-range accuracy so you must get close to your enemies to actually land a shot where you expect. Load up this agile (but reluctant) cat with ammo and flank your enemies with a constant flow of bullets.


Tier Mobility Protection Firepower
I Tracks Parts Horizontal Drive Shot Mk.1 APHV/T
II Suspension Brake System FPE Adjustment of Fire Shell Mk.1 AP/T
III Filters Crew Replenishment Elevation Mechanism Smoke grenade
IV Transmission Engine Artillery Support Shot Mk.IXB APCBC/T

Pros and cons


  • Good gun for its rank
  • Fast
  • Slim target
  • Has a "lock", which is a primitive form of stabilisation; this makes stopping and firing a useful tactic as the 2-pdr doesn't bounce as much as a non-stabilised gun
  • Brings lots of ammo to the fight (87 rounds max)
  • Has forward-launching smoke launchers
  • Coaxial machine gun
  • Good horse-power per ton ratio
  • Decent turret sewing rate
  • -15° gun depression
  • Four crewmen and a three-man turret
  • Quite a fast reload, makes finishing off a target both quicker and easier
  • Very effective in its historical role, a flanker and scout


  • Next to no armour
  • Barely any response from the engine
  • Loses speed when turning
  • The ability to carry almost 90 rounds comes at a cost, this cost is that the ammunition is very hard to miss and thus, the A13 series suffers from frequent ammunition detonations
  • Wiggles when trying to turn on 5th gear
  • Regular machine guns can penetrate side armour
  • The coaxial machine gun is a Vickers which, compared to other Rank I machine guns, has an incredibly slow fire rate
  • Not effective at anything other than how it was historically used; ill-advised to brawl or support heavier vehicles



The British development on their cruiser tanks, tanks that focus on mobility to exploit breakthroughs beyond enemy lines, took a turn in 1936 after General Giffard LeQuesne Martel became the Assistant Director of Mechanization at the British War Office, the head of the army in the government. Martel, an advocate of the tanks, and developer of the concept of "tankettes", witnessed a tank demonstration in 1936 that had Soviet designs. The one that attracted his attention was the BT light tank. The BT's use of the Christie suspension had Martel argue for the usage of the same suspension in their tank designs, to which the British government complied with the purchase and licensing of the system from the Nuffield Organization.

The acquired vehicle from the purchase of the Christie suspension was labelled as the A13E1 and became part of the design development under the designation Cruiser Mk III (A13). The General Staff requested for the vehicle to have 30 mm of armour, a 2-pounder gun, and a road speed of 48 km/h. The original vehicle was extensively reworked due to many interior and mechanical issues. Until the tank design was finished, the British Army adopted the Cruiser Mk I (A9) tank for use, but these tanks were delayed due to the A13's near completion. The first prototype was delivered in 1937 under the name A13E2, this featured the turret from the A9 cruiser tank, with a 2-pounder and a Vickers machine gun. The armour on the prototype was 15 mm and the design could reach a top speed under a governor of 48 km/h (64 km/h ungoverned). The last and revised design was the A13E3 that became adopted by the British Army and ordered into production in 1939. The General Staff specification number for the tank was the A13 Mk. I, Cruiser Tank Mark III. 65 of these tanks were ordered from the Nuffield Mechanization & Aero Limited, to which 30 were built before the War Office decided to upgrade the A13 Mk.I with more armour than the A13 Mk.II, Cruiser Tank Mk IV. Some of the A13 Mk.I Cruiser Mk III was also converted into Mk IV to stay modernized.

Combat usage

The A13 first saw combat in the Battle of France under the British Expeditionary Force in 1940. The A13 encountered many troubles during its employment, the crew having little to no training with the new tanks due to their rushed adoption into service. The tanks were in poor condition and some were even missing parts. The A13s were used in the 1st Armoured Division, but many were either destroyed by the superior German armoured forces or abandoned at Calais during the evacuation of Allied troops at Dunkirk, which forced the units to leave behind their heavier equipment.

After the disaster at France, the A13 were still used to support the war. Some were sent to Greece to support their defence against Germany in the Battle of Greece, but a majority were sent to North Africa as part of the Western Desert Campaign near Libya under the 7th Armoured Division. Compared to the time in France, the A13s in North Africa fared much better, ironing out most of its initial defects, and was even more suited to the environment than other tank designs. The A13 was popular with the crew for its high speed, reliability, and a powerful 2-pounder cannon that could engage a majority of Axis tanks in 1941. However, there was an insufficient number of A13s available for use, so tank units were mixed with the faster cruiser tanks and slower infantry tanks, which caused tactical and logistical difficulties trying to accommodate all of the tanks. Another deficiency with the tank and every other British tank with the 2-pounder was the lack of high-explosive shell issued to the tankers, which made them vulnerable to anti-tank guns, which caused a majority of British tank losses in the North African Campaign. Still, the A13 fared very well with its armour and armament until late 1941 where better armoured Panzer IIIs and Panzer IVs began to appear on the battlefield.

Due to its growing obsolescence on the battlefield, the A13 was replaced in 1941 by the better armoured A15 Crusader tank.



See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

  • reference to the series of the vehicles;
  • links to approximate analogues of other nations and research trees.

External links

Paste links to sources and external resources, such as:

  • topic on the official game forum;
  • encyclopedia page on the tank;
  • other literature.

Britain light tanks
Armoured cars  Daimler Mk II · AEC Mk II
A13  A13 Mk I · A13 Mk I (3rd R.T.R.) · A13 Mk II · A13 Mk II 1939
A15  Crusader II · Crusader "The Saint" · Crusader III
A17  Tetrarch Mk I
Post war  Warrior · VFM5
Foreign  Stuart I (USA) · Stuart III (USA) · Rooikat Mk.1D (South Africa)