[1] She is best known for her action during the Gallipoli Campaign of World War I as she sank Royal Australian Navy submarine HMAS AE2 in the Sea of Marmara and captured her crew.

In addition, she daily transported German general Otto Liman von Sanders, who was the adviser and military commander of the Ottoman Army, between Eceabat and Gallipoli.

On the way, Commander Ali Rıza Bey changed his route and sailed eastwards in response to reports of the presence of a possible enemy submarine in that area.

[2] The Australian submarine HMAS AE2 was able to pass through the blocked Dardanelles Strait and entered the Sea of Marmara on the early hours of 25 April 1915.

[2][3][4] Lieutenant Commander Henry Hugh Gordon Stoker scuttled AE2 by opening all tanks and flooding his submarine, which was unable to maneuver.