Mirabeau was one of the six Danton class semi-dreadnought battleships built for the French Navy (armée navale) in the first decade of the twentieth century. The ship spent most of World War I blockading the Straits of Otranto and the Dardanelles to prevent German, Austro-Hungarian and Turkish warships from breaking out into the Mediterranean. She did, however, participate in the attempt to ensure Greek acquiescence to Allied operations in Macedonia in late 1916. Mirabeau briefly participated in the occupation of Constantinople after the end of the war and was deployed in the Black Sea in early 1919 during the Allied intervention in the Russian Civil War. She ran aground in February 1919 off the coast of the Crimea and could not be refloated until some of her guns and armor were removed. Af