"Suffren" returned to the Dardanelles on 9 January 1915 and resumed her role as the flagship of the squadron. She bombarded the Ottoman fort of Kum Kale, on the Asiatic side of the strait on 19 February. assisted "Suffren" by sending firing corrections via radio while "Gaulois" provided counter-battery fire to suppress the Ottoman coastal artillery. Late in the day the British predreadnought was bombarding the fort at Orhaniye Tepe on the Asiatic side of the strait and began taking heavy fire as she approached the fort. The battlecruiser attempted to suppress the coastal artillery to allow "Vengeance" to extricate herself, but was unsuccessful. "Suffren" and "Gaulois" had to combine their fire with that of "Inflexible" before "Vengeance" could successfully withdraw. "Suffren" fired thirty 305-millimetre shells and 227 shells from her secondary guns during the day.