The Armée d'Orient fought on the front that was created as an aid to what country?
Armée d'Orient (1915–19): The Armée d'Orient (AO) was a Field army of the French Army during World War I who fought on the Macedonian Front. Macedonian Front: The Macedonian Front of World War I, also known as the Salonica Front (after Thessaloniki), was formed as a result of an attempt by the Allied Powers to aid Serbia, in the fall of 1915, against the combined attack of Germany, Austria-Hungary and Bulgaria.
Serbia