After Greece's entry in World War I in June 1917, the Corps was reformed and participated in the Macedonian front operations in 1917–1918, fighting against the Bulgarians on the Struma front in eastern Macedonia. It subsequently dispatched the major part of its force (2nd and 13th Divisions under Major Gen. Konstantinos Nider) to the Crimea and the Ukraine, as part of the unsuccessful Southern Russia intervention.
