 Machanidas of Sparta learnt this the hard way when his artillery at the battle of Mantinea in 207 BC was quickly taken by Philopoemen's Achaean infantry.Philip V of Macedon used artillery, in conjunction with defensive field works, in his defence of the Aous Valley in the Second Macedonian War, causing high Roman casualties.Antiochus the Great is attested to have used it at Thermopylae, resting it in imposing positions over the prospected battlefield.