Battle of Chaeronea
The Battle of Chaeronea was fought between Philip of Macedon and an army from the Greek city states of Athens and Thebes in 338 B.C. Philip's 32,000 men defeated the allied force of 50,000, leaving 20,000 dead. The losses of Philip are unknown but must have been severe. This ended the Fourth Sacred War. Philip was the unquestioned master of Greece. His son Alexander fought in the battle as a commander of cavalry.
Encyclopedia of Military History, Dupuy & Dupuy, 1979