On 1 May, "Yavuz" sailed to the Bay of Beikos in the Bosphorus after the Russian fleet bombarded the fortifications at the mouth of the Bosphorus. Around 7 May, "Yavuz" sortied from the Bosphorus in search of Russian ships as far as Sevastopol, but found none. Running short on main gun ammunition, she did not bombard Sevastopol. While returning on the morning of 10 May, "Yavuz"s lookouts spotted two Russian pre-dreadnoughts, and , and she opened fire. Within the first ten minutes she had been hit twice, although she was not seriously damaged. Admiral Souchon disengaged and headed for the Bosphorus, pursued by Russian light forces. Later that month two of the ship's 15 cm guns were taken ashore for use there, and the four 8.8 cm guns in the aft superstructure were removed at the same time. Four 8.8 cm anti-aircraft were installed on the aft superstructure by the end of 1915.