Ottoman torpedo boat Sultanhisar

Sultanhisar was a torpedo boat of the Ottoman Navy. She was built in 1907 by Schneider & Cie in Chalon-sur-Saône, France, and transferred the same year to Turkey. She is best known for her action during the Gallipoli Campaign of World War I as she sank a Royal Australian Navy submarine in the Sea of Marmara and captured her crew.

Task
As of October 16, 1912, she was assigned to the Bosporus Fleet Command. From December 19, 1912 on, she served at the Armoured Warship Division.

During the naval operations in the Dardanelles Campaign of World War I, the torpedo boat Sultanhisar was tasked with patrolling in the Dardanelles Strait. 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 April 29, 1915, she received orders to return to Constantinople by sailing along the west coast of the Sea of Marmara. 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.

Attack on Australian submarine
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 April 25, 1915. She was the first Allied ship so to do.

Sultanhisar sighted the submarine in the morning of April 30 in the Erdek Bay near Bandırma. The AE2 tried to escape by diving and surfacing several times. Torpedoes were exchanged between the two warships unsuccessfully. In the meantime, Sultanhisar called the Ottoman gunboats Zuhaf and Aydın Reis, which were patrolling in the area, for help. Finally, the submarine surfaced about 100 m from the torpedo boat. Sultanhisar opened fire and hit the submarine's engine room.

Lieutenant Commander Henry Stoker scuttled the AE2 by opening all tanks and flooding his submarine, which was unable to maneuver. The crew abandoned the vessel, and she went down at 10:45. At this moment, the two Ottoman gunboats arrived at the scene and offered to rescue the submarine's crew, who had all survived the attack. Rejecting that offer, Commander Ali Rıza Bey took the 32 sailors on board and sailed back to Gallipoli. After picking up two more POWs, one French and one British soldier, in Gallipoli, Sultanhisar headed for Istanbul.

Aftermath
The Sultanhisar served until the end of the World War I and was decommissioned by the end of October 1918, after the Armistice of Mudros. Following the foundation of the Turkish Republic in 1923 in place of the dissolved Ottoman Empire, she returned in 1924 to service in the Turkish Navy. She was decommissioned in 1928 and was broken up in 1935.

Namesakes
The name "Sultanhisar", a town in the Aydın Province of Aegean Region in Turkey, was given later to two other warships of the Turkish Navy:
 * TCG Sultanhisar, a Demirhiasr-class destroyer
 * TCG Sultanhisar (P-111) a Hisar-class patrol boat