Pontic Greek genocide
After World War I, the Ottoman Empire and Great Britain signed the Armistice of Mudros. This agreement allowed Greek survivors of the War to go back to their homes in Anatolia. However, most of their homes were destroyed and it was not safe for them to stay there. The armistice also allowed Greece to invade in Turkey if they felt like they needed to protect the Greeks in Anatolia. This is why Greece came to the city of Smyrna on May 15, 1919 and started the Second Greco-Turkish War.