Bismarck was armed with eight 38 cm (15 in) SK C/34 guns arranged in four twin gun turrets: two super-firing turrets forward—"Anton" and "Bruno"—and two aft—"Caesar" and "Dora".[lower-alpha 3] Secondary armament consisted of twelve 15 cm (5.9 in) L/55 guns, sixteen 10.5 cm (4.1 in) L/65 and sixteen 3.7 cm (1.5 in) L/83, and twelve 2 cm (0.79 in) anti-aircraft guns. Bismarck also carried four Arado Ar 196 reconnaissance floatplanes, with a single large hangar and a double-ended catapult.[7] The ship's main belt was 320 mm (12.6 in) thick and was covered by a pair of upper and main armoured decks that were 50 mm (2.0 in) and 100 to 120 mm (3.9 to 4.7 in) thick, respectively. The 38 cm (15 in) turrets were protected by 360 mm (14.2 in) thick faces and 220 mm (8.7 in) thick sides.[1]