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Courbet was the lead ship of her class of four dreadnought battleships, the first ones built for the French Navy. She was completed shortly before the start of World War I in August 1914. She spent the war in the Mediterranean, where she helped to sink an Austro-Hungarian cruiser, covered the Otranto Barrage that blockaded the Austro-Hungarian Navy in the Adriatic Sea, and often served as a flagship. Although upgraded several times before World War II, she was not considered to be a first-line battleship by the 1930s and spent much of that decade as a gunnery training ship.