Heavy tank
The Char 2C was one of the largest tanks ever produced. At the start of World War II, France and the Soviet Union were the only countries to have inventories of heavy tanks, such as the Char B1, T-35, and KV-1. The Matilda II was designed under the British infantry tank concept which is similar to the heavy tank having thick armor and weighing more than their other tanks. It’s usually separate because they have less firepower with their cruiser tanks (comparable to mediums) at the time having the same main armament but more machine guns. Later war examples were the German Tiger I and II, as well as the Soviet IS series. Note that "heavy" versus "medium" is more a question of tactical roles than weight; the Panther, for example, was a "medium" tank that outweighed most Allied "heavy" tanks.
FCM 1A
Testing began on 20 November 1917 after six months of delays. The vehicle was the largest tank built up to that point, measuring long. The hull was extremely elongated in order to cross the trenches of the Western Front. The tank originally had a crew of 7, but the crew was reduced to 6 in December. The main armament was a shortened version of the Canon de 105 Court Schneider with a large ammunition capacity of 122 rounds.