
Greece during World War I
At the outbreak of World War I in August 1914, the Kingdom of Greece remained neutral. Nonetheless, in October 1914, Greek forces once more occupied Northern Epirus, from where they had retreated after the end of the Balkan Wars. The disagreement between King Constantine, who favoured neutrality, and the pro-Allied Prime Minister Eleftherios Venizelos led to the National Schism, the division of the state between two rival governments. Finally, Greece united and joined the Allies in the summer of 1917.
The Macedonian front stayed mostly stable throughout the war. In May 1918, Greek forces attacked Bulgarian forces and defeated them at the Battle of Skra-di-Legen on 30 May 1918. Later in 1918, the Allied forces drove their offensive from Greece into occupied Serbia. In September of that year, Allied forces (French, Greek, Serb, Italian, and British troops), under the command of French general Louis Franchet d'Espèrey, broke through the German, Austro-Hungarian, and Bulgarian lines along the Macedonian front. Bulgaria later signed the Armistice of Salonica with the Allies in Thessaloniki on 29 September 1918. By October, the Allies-including the Greeks under French general Louis Franchet d'Espèrey, had re-taken all of Serbia and were ready to invade Hungary when Hungarian authorities offered surrender.
The Greek military suffered an estimated 5,000 deaths from their nine divisions that participated in the war.[96]
After the war[edit]
As Greece emerged victorious from World War I, it was rewarded with territorial acquisitions, specifically Western Thrace (Treaty of Neuilly-sur-Seine) and Eastern Thrace and the Smyrna area (Treaty of Sèvres). Greek gains were largely undone by the subsequent Greco-Turkish War of 1919 to 1922.[97]