The I Corps of the Ottoman Empire (Turkish: 1 nci Kolordu or Birinci Kolordu) was one of the corps of the Ottoman Army consisting of ethnic Albanians. It was formed in the early 20th century during Ottoman military reforms Formation Order of Battle, 1911 With further reorganizations of the Ottoman Army, to include the creation of corps level headquarters, by 1911 the I Corps was headquartered in Harbiye. The Corps before the First Balkan War in 1911 was structured as such: I Corps, Harbiye, Constantinople (Ferik Zeki Pasha) 1st Infantry Division, Harbiye, Constantinople 1st Infantry Regiment, Harbiye, Constantinople 2nd Infantry Regiment, Bakırköy, Constantinople 3rd Infantry Regiment, İşkodra 1st Rifle Battalion, Taksim, Constantinople 1st Field Artillery Regiment, Taksim, Constantinople 1st Division Band, Harbiye, Constantinople 2nd Infantry Division, Selimiye, Constantinople (Mirliva Prens Aziz Pasha) 4th Infantry Regiment, İşkodra 5th Infantry Regiment, Selimiye, Constantinople 6th Infantry Regiment, Selimiye, Constantinople 2nd Rifle Battalion, Selimiye, Constantinople 2nd Field Artillery Regiment, Selimiye, Constantinople 2nd Division Band, Selimiye, Constantinople 3rd Infantry Division, Pangaltı, Constantinople (Mirliva Osman Pasha) 7th Infantry Regiment, Taşkışla, Constantinople 8th Infantry Regiment, Taşkışla, Constantinople 9th Infantry Regiment, Kağıthane, Constantinople 3rd Rifle Battalion, Tophane, Constantinople 3rd Field Artillery Regiment, Rami Kışlası, Constantinople 3rd Division Band, Taşkışla, Constantinople Units of I Corps 1st Rifle Regiment, Yıldız, Constantinople 1st Cavalry Brigade, Davutpaşa, Constantinople 1st Cavalry Regiment, Yıldız, Constantinople 2nd Cavalry Regiment, Davutpaşa, Constantinople 2nd Cavalry Brigade, Davutpaşa, Constantinople 3rd Cavalry Regiment, Davutpaşa, Constantinople 4th Cavalry Regiment, Selimiye, Constantinople 1st Horse Artillery Battalion, Davutpaşa, Constantinople 1st Mountain Artillery Battalion, Münzevî Kışlası, Constantinople 1st Field Howitzer Battalion, Gümüşsuyu, Constantinople 1st Engineer Battalion, İplikhane, Constantinople 1st Telegraph Battalion, Ertuğrul Kışlası, Constantinople 1st Medical Battalion, Ahırkapı, Constantinople 1st Railroad Battalion, Ahırkapı, Constantinople 2nd Railroad Battalion, Ahırkapı, Constantinople War Academy, Harbiye, Constantinople Cavalry Squadron, Harbiye, Constantinople Infantry Company, Harbiye, Constantinople Provisional Companies x 2, Harbiye, Constantinople Machine-gun Company, Harbiye, Constantinople Bosporus Fortified Area Command, Bosporus, Constantinople 1st Heavy Artillery Regiment, Bosporus, Constantinople 2nd Heavy Artillery Regiment, Bosporus, Constantinople Searchlight Detachment, Bosporus, Constantinople Torpedo Detachment, Bosporus, Constantinople Mine Detachment, Bosporus, Constantinople Wireless Detachment, Bosporus, Constantinople Balkan Wars Order of Battle, October 17, 1912 On October 17, 1912, the corps was structured as follows: I Corps (Thrace, under the command of the Eastern Army) 2nd Division, 3rd Division 1st Provisional Division Order of Battle, October 29, 1912 On October 29, 1912, the corps was structured as follows: I Corps (Thrace, under the command of