 At the outbreak of World War I at the end of July 1914, Greece's pro-German monarch, Constantine I, decided to remain neutral.The Entente powers landed troops in Salonika in 1915, which was a source of tension between France and Greece.Ultimately, the French seized the Greek Navy on 19 October 1916; the heavy units of the Greek fleet were disarmed and placed in reserve for the remainder of the war.