Battle of Oltu
The Battles of Oltu were two armed conflicts; the first took place between Armenia and Turkish militias in the Oltu region, which at this time was part of Armenia. The second battle was fought on 3–5 September 1920, marking the beginning of the Turkish invasion of Armenia, resulting in Turkish forces driving the Armenians out of Oltu.
Background
After the Russo-Turkish War of 1877-1878, according to the Treaty of San Stefano and the Treaty of Berlin, the surroundings of Oltu were annexed by the Russian Empire in 1878, forming the Olti okrug of the Kars oblast. At the beginning of World War I, the Ottoman Empire briefly occupied these lands, but at the by the beginning of 1915, Russia regained control of them.After World War I ended with Ottoman Empire defeat and the Russian Empire had come apart in the Russian Civil War, separate governments formed in Georgia and Armenia. The Treaty of Sèvres which established the new boundaries for the Ottoman Empire had not yet been signed. The district of Oltu, known then as Ardahan-Olty, was disputed by Georgia, Armenia and Turkey. Georgia assumed de jure authority over it when they claimed independence on May 26, 1918. The Republic of Armenia also assumed de jure authority over this region on May 28, 1918.