 Of all the responsibilities given the two ships , the most important was to guard the Eastern Mediterranean against a breakout by Goeben , but when Goeben and Breslau finally made their breakout attempt on 20 January 1918 , Lord Nelson was away at Salonika and Agamemnon could not get steam up to depart Mudros in time to participate in the resulting Battle of Imbros . After both German ships struck mines , Breslau sank and Goeben returned to the Dardanelles before Agamemnon could arrive on the scene . 
