User blog comment:Gigantigersaurus/Mark IV VS Saint-Chamond Tank/@comment-4661256-20120817234059/@comment-5232784-20120818020047

EA: The chamond Tank had 2 types of cannon. The second type, added to the design after the 165th tank, is listed below:

http://en.wikipedia.org/wiki/Canon_de_75_mod%C3%A8le_1897

That has a whole lot of info on it

I'll add info on the 6-pounder soon