The XI Corps of the Ottoman Empire (Turkish: 11 nci Kolordu or On Birinci Kolordu) was one of the corps of the Ottoman Army. It was formed in the early 20th century during Ottoman military reforms. Formation With further reorganizations of the Ottoman Army, to include the creation of corps level headquarters, by 1911 the XI Corps was headquartered in Van. The Corps before the First Balkan War in 1911 was structured as such: XI Corps, Van 33rd Infantry Division, Van 88th Infantry Regiment, Van 89th Infantry Regiment, Başkale 90th Infantry Regiment, Bayezit 33rd Rifle Battalion, Van 33rd Division Band, Van 34th Infantry Division, Muş 91st Infantry Regiment, Muş 92nd Infantry Regiment, Malazgirt 93rd Infantry Regiment, Kara Kilise 34th Rifle Battalion, Yemen 34th Division Band, Muş Units of IX Corps 23rd Cavalry Regiment, Van 21st Field Artillery Battalion, Van 11th Transport Battalion, Van 22nd Mountain Artillery Battalion Border companies x 8 Balkan Wars Order of Battle, July 1913 XI Corps (Caucasus) 34th Division World War I Order of Battle, August 1914, November 1914, April 1915, Late Summer 1915, January 1916, August 1916 In August 1914, November 1914, Late April 1915, Summer 1915, January 1916, August 1916, the corps was structured as follows: XI Corps (Caucasus) 18th Division, 33rd Division, 34th Division Sources Corps of the Ottoman Empire Military units and formations of the Ottoman Empire in World War I History of Van, Turkey