Defeat came at the Battle of Chaeronea (338 BC), the decisive contest in which Philip II of Macedon, with his son Alexander, extinguished Theban hegemony. The battle is the culmination of Philip's campaign into central Greece in preparation for a war against Persia. It was fought between the Macedonians and their allies and an alliance of Greek city-states led by Athens and Thebes. Diodorus records that the numbers involved for the two armies were more or less equal, both having around 30,000 men and 2,000 cavalry.