US Anti-tank gun

At the beginning of World War II, the anti-tank gun of the British Army was the Boys. It was developed in 1934 by Captain Boys of the design bureau at the Royal Small Arms Factory in Enfield.
After completing a series of tests, in November 1937 this weapon was formally adopted by the British Army under the name Boys Anti-tank Rifle Mark I. By 1942, anti-tank guns were being retired from service, having become ineffective on the evolving battlefield. The Boys was actively supplied the armies of the United States and Canada, and a total of about 69,000 units were produced.
The Boys was used in limited numbers by the Finns against Soviet tanks in the Winter War of 1940.