So the roman legion vs the phalanx was worthless when the Romans got there legion. The started out destroying the Macedonians. They were no match well actually the Romans almost lost Greece cause of that. But a military tribune hit the Macedonians from the back and easily broke there line. And the Macedonians scattered and and king Philip. Had to give his son as a hostage and renounce his kingship and he lost his empire to the Romans.