With the British seeking new armoured cars, the US Ordnance Corps issued specifications for a heavily armoured car. Delivered in 1942 by the Yellow Coach Company, the armoured car that would be the T18 was a heavy 8x8 suspension armoured car armed with a 37 mm anti-tank cannon. The 37 mm was not considered effective by the time, so the design was improved to the T18E2 variant with a 57 mm anti-tank cannon. However, the heavy armoured car's heavy weight and consequential mobility disadvantages, as well as its expensive price, led to a declining interest in the T18E2. As such, only a limited number was built and transferred to the British, which used them in limited fashion during the North Africa campaign.

The T18E2 was introduced in Update 1.77 "Advancing Storm" in the 2018 "Chronicles of World War II" that took place between the 14th of April till the 10th of May of the same year. It was obtainable by earning 6 "Chronicle awards" in ground vehicles. Players that earned the T18E2 gained access to an impressively-armoured car, capable of withstanding 37 mm and even 50 mm fire. The high-penetrating 57 mm M1 cannon in the T18E2 also benefits from a single-plane stabilizer for a better shooting platform after moving. The combination of its good ballistics, high armor penetration, high-explosive shell, and high rate of fire makes the "Boarhound" an extremely dangerous opponent in firefights. The only drawback of the vehicle is its poor off-road capability: while on paved roads the "Boarhound" has decent acceleration dynamics and high speed, on rough terrain, especially in mud or water obstacles, the armored car's mobility starts to fall behind even heavy tanks.