as a 12-inch shell partially penetrated the armor casemate protecting one of Yavuzs secondary guns. It detonated some of the ready-use ammunition, starting a fire that burnt out the casemate and killed its crew. Yavuz returned fire shortly afterwards and hit Evstafi in the middle funnel; the shell detonated after it passed through the funnel and destroyed the antenna for the fire-control radio, which meant that Evstafi could not correct Ioann Zlatousts inaccurate range data. Yavuz hit Evstafi four more times. although one shell failed to detonate, before Rear Admiral Wilhelm Souchon decided to turn away and break contact after fourteen minutes of combat. Evstafi suffered 34 killed and 24 wounded from those hits. Evstafi only fired between 12 and 16 12-inch shells as well as 14 eight-inch and 19 six-inch shells. Several armour plates on Evstafi required replacement after the battle and they were taken from the old pre-dreadnought so that the repairs were completed by 29 November. On 9 January 1915 Midilli and the encountered the Russian fleet while returning from a mission in the eastern part of the Black Sea. Midilli hit Evstafis forward turret with a shell, temporarily putting it out of action, and the two cruisers escaped using their superior speed. Evstafi and Ioann Zlatoust served as the covering force for several bombardment missions of the Bosphorus between 18 March and 9 May 1915. The two earlier bombardments were uneventful, but the 9 May bombardment provoked a reaction as Yavuz intercepted the Russian battleships after they'd been spotted by the . Both forces turned on parallel courses and opened fire at the range of . Neither side scored a hit although Yavuz had multiple near-misses on Evstafi. Admiral Eberhardt ordered his ships to make only while Yavuz was making . Yavuz was unable to cross the T of the Russian ships, despite its superior speed, as they were continually turning. This manoeuvre bought enough time that Tri Sviatitelia and Pantelimon were able to rejoin the other two ships before they could start shelling the Ottoman forts. Pantelimon hit Yavuz twice before the German ship broke contact after 22 minutes of firing. With the fleet assembled Admiral Eberhardt attempted to pursue the enemy battlecruiser, but was unsuccessful. On 1 August 1915 she, and all the other pre-dreadnoughts, were transferred to the 2nd Battleship Brigade, after the dreadnought had entered service. On 1 October the new dreadnought