The first military confrontation at Bitlis occurred in July 1915, when Russian troops launched an unsuccessful assault on the town's fortifications. The second confrontation began in February 1916 and ended with the capture of Bitlis by new Russian corps, which largely consisted of the 1st Battalion of the Armenian volunteer units under the command of Andranik Ozanian. The town was the last stronghold of the Ottoman Empire to prevent the Russians from entering in Anatolia and Mesopotamia.