 In October 1912, the Balkan League declared war on the Ottomans, a month before the Italo-Turkish War ended.At the time, "Mesudiye" was moored off Büyükdere, a neighborhood in Constantinople, with the torpedo boats and , stationed as a guard ship.In December, the Ottoman fleet was reorganized, with "Mesudiye" joining the newly formed Battleship Division, under the command of Ramiz Naman Bey.