Large American gun is demonstrated - shells are loaded and the gun is fired.
A group of men run to, then climb onto a large military vehicle which incorporates a large gun. Issue sheet states that it is an American weapon. The gun fires and a large amount of smoke fills the sky. Shots of the vehicle as the gun is lowered and aimed. Two young boys watch as shells are lifted on to the vehicle. C/U of the end of the gun. Men load the shells (they are not in military uniform). The gun is raised (unusual shot from underneath barrel) and fired - lots of smoke.
Was an American Pathe News item.