Char B1 Bis PlatoonBolt Action Char B1 Bis Platoon En 402015501 : Upgrading the Char B1, the Char B1 bis had thicker armour and an APX4 turret with a longer barrelled (L 32) 47 mm SA 35 gun, giving it more anti tank capacity alongside the 75mm hull mounted howitzer. French experiences during The Great War influenced their belief a breakthrough tank would be needed in future conflicts, hence the design of the heavy Char B1 and B1 bis. Among the most powerful tanks at the