Originally Posted by zraver

Tanks differ from tankettes in two major areas.

1- Tankettes do not have turrets.

2- All tanks were fully enclosed.

Originally Posted by zraver

Tank cannon from 1916 to 1939 are very ecclectic. The first cannon mounte don a tank had better anti-tank capabilites than any gun mounted on any tank in 1939 found west of the Vistula (British naval 6pdr). The first turreted tank to mount a cannon rahter than MG's nmounted the short barreled low velociy 37mm. This same type of gun and tank was still in use as late as the invasion of Sicily. post war the main british giun was the three pounder, but they entered WW2 with the 2 pounder. America's fleet of Liberty Mk VII's was the biggest force of heavy tanks in the world in the 20's. By the 30's the US outlawed tanks over 11 tons.

The US T-20 medium tank mounted a 57mm gun before the weight laws, this was a ta time when no one else was thinkign of using tanks as the anti-tank weapon.