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Sister ships: MAJESTIC, MAGNIFICENT, PRINCE GEORGE, VICTORIOUS, JUPITER, CAESAR, HANNIBAL, ILLUSTRIOUS
Notes: The largest class of battleships ever built (nine ships), the MAJESTICs combined the basic features of the ROYAL SOVEREIGN class with improvements already adopted in the preceding RENOWN. A wire-wound 12" gun was substituted for the 13.5" gun of earlier classes; the savings in weight allowed an expansion of smaller gun batteries. The 12" gun proved superior to the 13.5" in every aspect save for weight of shell, and became the standard British main gun for 16 years. All vertical armor was Harvey NS. The class proved to be good sea boats, with an easy roll, and maneuvered well. They were regarded as good steamers, but had a very high rate of fuel consumption. MARS was fitted to carry 400 tons of oil fuel in a refit in 1905-1906 (sacrificing 200 tons of coal). The conversion was very successful, and by 1908, the rest of the class had been so fitted.
MARS served the major portion of her active career in Home waters. She was placed in Reserve in 1906, but recommissioned into the Channel Fleet later that year. MARS was refitted in 1908-1909 and again in 1911-1912. Until the outbreak of World War I, MARS served with the 4th Division, Home Fleet. In in 1914, MARS was earmarked for the 9th Battle Squadron, but upon the outbreak of World War I, she was assigned to the Humber as a guardship. In February, 1915, MARS and her sister MAGNIFICENT had their 12" turrets removed for installation in the monitors EARL OF PETERBOROUGH and SIR THOMAS PICTON. Refitted as a troop transport, MARS was sent to the Mediterranean in September, 1915, and took part in the Anzac and Cape Helles troop evacuations in January, 1916. She was paid off later in 1916 and served as a depot ship at Invergordon. MARS was sold for breaking up in 1921.