Eventually, Philip defeated Onomarchus. Demosthenes’ (born in 384) main speeches against Philip were called Philippics. Athens and Macedonia went to war. They agreed to the Peace of Philocrates in 346. The peace lasted from 346 to 341. Then war began again. In 338, Philip, with Alexander commanding the cavalry, defeated the combined forces of Thebes and Athens among others at the battle of Chaeronea. This victory made Philip master of Greece. In 336, he was assassinated.