Battle of Cunaxa
The Battle of Cunaxa was fought in 401 B.C. as part of a civil war in the Persian Empire. In that battle the Persian Emperor Artaxerxes II was opposed by Cyrus the satrap of Lydia. Artaxerxes had about 100,000 men. Although Cyrus had the upper hand on the right side of the battle, his death led to his forces fleeing except for a force of Greek mercanaries under Clearchus who then swept Artaxerxes' army from the field. Nevertheless, the rebel claimant had died and Artaxerxes was still Emperor. He invited the victorious Greek general and his senior officers to a feast, then treacherously killed them. This led to the infamous March of the 10,000.
Encyclopedia of Military History, Dupuy & Dupuy, 1979