Design
Bretagne was laid down at the Arsenal de Brest on 1 July 1912, launched on 21 April 1913, and completed in September 1915. She was commissioned into the French Navy on 10 February 1916. The ship was 166 meters (544 ft 7 in) long overall and had a beam of 26.9 m (88 ft 3 in) and a full-load draft of 9.8 m (32 ft 2 in). She displaced around 25,000 metric tons (25,000 long tons; 28,000 short tons) at full load and had a crew of between 1124 and 1133 officers and enlisted men. She was powered by four Parsons steam turbines with twenty-four Niclausse boilers. They were rated at 29,000 shaft horsepower (22,000 kW) and provided a top speed of 20 knots (37 km/h; 23 mph). Coal storage amounted to 2,680 t (2,640 long tons; 2,950 short tons).
Bretagne's main battery consisted of ten 340mm/45 Modèle 1912 guns mounted in five twin gun turrets, numbered from front to rear. They were placed all on the centerline; two were in a superfiring pair forward, one amidships, and the last two in a superfiring arrangement aft. The secondary battery consisted of twenty-two Canon de 138 mm Modèle 1910 guns in casemates along the length of the hull. She also carried seven 47 mm (1.9 in) Hotchkiss guns, two on the conning tower and one on the roof of each turret. The ship was also armed with four submerged 450 mm (17.7 in) torpedo tubes. The ship's main belt was 270 mm (10.6 in) thick and the main battery was protected by up to 300 mm (11.8 in) of armor. The conning tower had 314 mm (12.4 in) thick sides.
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