In the First World War, the city was one of the main objectives of the Ottoman army during the lost Battle of Sarikamish in the Caucasus Campaign. Russia ceded Kars, Ardahan and Batum to the Ottoman Empire under the Treaty of Brest-Litovsk on 3 March 1918. However, by then Kars was under the effective control of Armenian and non-Bolshevik Russian forces. The Ottoman Empire captured Kars on 25 April 1918, but under the Armistice of Mudros (October 1918) was required to withdraw to the pre-war frontier and Kars came under control of the First Republic of Armenia. The Ottomans refused to relinquish Kars; its military governor instead established a government, the Provisional National Government of the Southwestern Caucasus, led by Fahrettin Pirioglu, that claimed Turkish sovereignty over Kars and Turkish-speaking regions as far as Batumi and Alexandropol (Gyumri). Much of the region fell under the administrative control of Armenia in January 1919 but the pro-Turkish government remained in the city until a joint operation launched by British and Armenian troops dissolved it on 19 April 1919, arresting its leaders and sending them to Malta. In May 1919 Kars came under the full administration of the Armenian Republic and became the capital of its Vanand province.