The Armée d'Orient was formed in September 1915 during the Conquest of Serbia by German-Austrian-Bulgarian forces.
It was shipped to the Greek port of Salonika, where its first units arrived on 5 October.
Despite several offensives, the front stabilized on the Greek-Serbian border until September 1918, when the Bulgarian army disintegrated after defeat in the Battle of Dobro Pole.
He was succeeded as commander of the Armée d'Orient by Victor Cordonnier, and the army itself was renamed the Armée française d'Orient (AFO).
After the victory against Bulgaria in the autumn of 1918, the AFO is divided in 3 parts :