-Extreme World and Engineering The M65 Atomic Cannon, often called Atomic Annie, was a towed artillery piece built by the United States and capable of firing a nuclear device. It was developed in the early 1950s, at the beginning of the Cold War, and fielded by 1953 in Europe and Korea. The Atomic Cannon, at 280 mm, was the largest nuclear capable mobile artillery piece manufactured. | Defense.US

The US Army only ever fired one nuclear artillery shell & this is what it looked like (video) - ProtoThema English

M65 Nuclear Artillery Test

The United States fire a 15-kiloton Nuclear artillery shell, 1953