allowed the Thebans to assault in strength the elite Spartan troops on the right flank of the opposing phalanx. Meanwhile, the centre and right flank of the Theban line were echeloned back, from the opposing phalanx, keeping the weakened parts of the formation from being engaged. Once the Spartan right had been routed by the Theban left, the remainder of the Spartan line also broke. Thus, by localising the attacking power of the hoplites, Epaminondas was able to defeat an enemy previously thought invincible. Philip II of Macedon spent several years in Thebes as a hostage, and paid attention to Epaminondas' innovations. On return to his homeland, he raised a revolutionary new infantry force, which was to change the face of the Greek world. Philip's phalangites were the first force of professional soldiers seen in Ancient Greece apart from Sparta. They were armed with longer spears (the sarissa) and were drilled more thoroughly in more evolved, complicated tactics and manoeuvres. More importantly, though, Philip's phalanx was part of a multi-faceted, combined force which included a variety of skirmishers and cavalry, most notably the famous Companion cavalry. The Macedonian phalanx now was used to pin the centre of the enemy line, while cavalry and more mobile infantry struck at the foe's flanks. Its supremacy over the more static armies fielded by the Greek city-states was shown at the Battle of Chaeronea, where Philip II's army crushed the allied Theban and Athenian phalanxes. Weaknesses The hoplite phalanx was weakest when facing an enemy fielding lighter and more flexible troops without its own such supporting troops. An example of this would be the Battle of Lechaeum, where an Athenian contingent led by Iphicrates routed an entire Spartan mora (a unit of 500–900 hoplites). The Athenian force had a considerable proportion of light missile troops armed with javelins and bows that wore down the Spartans with repeated attacks, causing disarray in the Spartan ranks and an eventual rout when they spotted Athenian heavy infantry reinforcements trying to flank them by boat. The Macedonian phalanx had weaknesses similar to its hoplitic predecessor. Theoretically indestructible from the front, its flanks and rear were very vulnerable, and once engaged it may not easily disengage or redeploy to face a threat from those directions. Thus, a phalanx facing non-phalangite formations required some sort of protection on its flankslighter or at least more mobile infantry, cavalry, etc. This was