In the battle the flagship of Philip V of Macedon, a very large galley bireme or trireme with ten banks of rowers, accidentally rammed one of her own ships when it strayed across her path, and giving her a powerful blow in the middle of the oarbox, well above the waterline, stuck fast, since the helmsman had been unable in time to check or reverse the ship's momentum. Trapped, the flagship was put out of action by two enemy ships, which rammed her below the waterline on each side.