ヘタイロイ
The individual Companion cavalry squadrons were usually deployed in a wedge formation, which facilitated both manoeuvrability and the shock of the charge. The advantage of the wedge was that it offered a narrow point for piercing enemy formations and concentrated the leaders at the front. It was easier to turn than a square formation because everyone followed the leader at the apex, "like a flight of cranes". Philip II introduced the formation, probably in emulation of Thracian and Scythian cavalry, though the example of the rhomboid formation adopted by Macedon's southern neighbours, the Thessalians, must also have had some effect.