Vergniaud was one of the six Danton class semi-dreadnought battleships built for the French Navy in the late 1900s. When World War I began in August 1914, she unsuccessfully searched for the German battlecruiser SMS Goeben and the light cruiser SMS Breslau in the Western Mediterranean and escorted convoys. Later that month, the ship participated in the Battle of Antivari in the Adriatic Sea and helped to sink an Austro-Hungarian protected cruiser. Vergniaud spent most of the rest of the war blockading the Straits of Otranto and the Dardanelles to prevent German, Austro-Hungarian and Turkish warships from breaking out into the Mediterranean.