Philip II's army beats the allied Greeks. His son Alexander, then a young man, fights in the battle.
He was also present at Chaeroneia and took part in the battle against the Greeks, and he is said to have been the first to break the ranks of the Sacred Band of the Thebans.
The battle has been called one of the most decisive of the ancient world. In its wake the League of Corinth made the Greek states allies of Macedon and of each other, with Philip as guarantor of the peace.
Based on Wikipedia: Battle of Chaeronea (338 BC)
The battle has been described as one of the most decisive of the ancient world.
The League of Corinth, formed as a result, made all participants allies of Macedon and each other, with Philip as the guarantor of the peace.