The Battle of Sakarya (Turkish: Sakarya Meydan Muharebesi), also known as the Battle of the Sangarios (Greek: Μάχη του Σαγγάριου), was an important engagement in the Greco-Turkish War (1919–1922) and Turkish War of Independence.The battle went on for 21 days from August 23 to September 13, 1921, close to the banks of the Sakarya River in the immediate vicinity of Polatlı, which is today a district of the Ankara Province.