The ships' 3.7 cm 83-caliber guns were twin mounted and placed in the superstructure. The mounts were hand-operated and automatically stabilized for roll and pitch. These guns were supplied with a total of 32,000 rounds of ammunition. Bismarck and Tirpitz were initially armed with twelve 2 cm guns in single mounts, though these were augmented over time. Both ships initially carried twenty-four thousand 2 cm rounds. Bismarck received a pair of quadruple gun mountings, for a total of twenty 2 cm guns. Over the course of her career, Tirpitzs 2 cm battery was increased to 78 guns in single and quadruple mountings. By 1944 she carried over ninety thousand 2 cm rounds.
