The Greek-Turkish War (1919-1922) was a conflict between Greece and Turkey following World War I. It arose from territorial disputes in the aftermath of the Treaty of Sèvres, which aimed to partition the Ottoman Empire. The war began when Greek forces landed in Izmir and sought to expand into western Anatolia, leading to a fierce military confrontation. The conflict ended with the Great Fire of Smyrna in 1922 and the subsequent Treaty of Lausanne in 1923, which established the modern borders of Turkey and resulted in significant population exchanges between the two nations. The war had lasting impacts on Greek and Turkish national identities.