 Ships of the RAN helped provide naval cover for the ambitious landings at Gallipoli, and the submarine "AE2" broke the blockade of the Dardanelles to harass Turkish shipping but was later sunk and her crew captured in the Sea of Marmara.In 1915 the light cruisers "Melbourne" and "Sydney" were deployed to the Atlantic where they worked alongside the Royal Navy's North American and West Indies Squadrons, which were engaged in surveillance operations on the large number of German ships that had taken refuge in neutral American ports when the war had broken out.This continued until September 1916 when both cruisers were moved to the North Sea where they joined "Australia", which had been assisting the Royal Navy in its blockade of the German High Seas Fleet.