 In February 1915 , Agamemnon was ordered to participate in the Dardanelles Campaign . She departed Portland on 9 February , and joined the British Dardanelles Squadron at Mudros 10 days later . That was the second day of the opening bombardment of the Ottoman Turkish forts guarding the entrance to the Dardanelles and the ship immediately joined the attack . She also took part in the subsequent bombardment of the inner forts later in February . Agamemnon was hit by seven 240 @-@ millimetre ( 9 @.@ 4 @-@ inch ) shells in ten minutes on 25 February and was holed above the waterline , suffering three dead . 
