What the phalanx was among the infantry, the Macedonian and Thessalian
The latter naturally took the highest rank of the whole Macedonian army, and bore the name of the “guards” or the “king’s guards.” It consisted of eight
Next in rank comes that peculiarly Macedonian body, the hypaspists. The Athenians under Iphicrates had already instituted, under the name of peltasts, a corps with linen corslets, and lighter shields and longer swords than those carried by the hoplites, in order to have a force swifter in attack than the latter and heavier than the light-armed troops. This new kind of corps was received with great approval in Macedonia; the soldier of the phalanx was too heavily armed for service about the person of the king, the light armed soldier was neither dignified nor serviceable enough. This intermediate force was selected for the purpose, and received the name of hypaspists from the long shield, the aspis, as it was called, which they had adopted from the phalanx. This force was of enormous value in a war against Asiatic tribes, for the lie of the land hampered only too often the full use of the phalanx, and it was often essential to attempt surprises, quick marches, and strokes of all sorts for which the phalanx was not sufficiently mobile nor the light troops sufficiently steady. For occupying heights, forcing the passage of rivers, and supporting and following up cavalry charges, these hypaspists were admirably adapted. Their numbers amounted to six thousand men. The whole corps was led by Nicanor, whose brother, Philotas, commanded the knights of the guard, and whose father, Parmenion, is described as general of the phalanxes. The first chiliarchy was that of Seleucus; it bore the title of “royal hypaspists,” and in its ranks the sons of noble families saw their first military service as pages of the king. The second bore the title of “royal escort of hypaspists,” and kept guard over the king’s tent.
THE LIGHT TROOPS
The light troops of the Macedonian army were of peculiar importance. They came from the countries of the Odrysians, Triballians, Illyrians, Agrians, and from upper Macedonia; they were armed with their national weapons of offence and defence, and exercised by the hunting and raiding to which they were accustomed at home and the countless petty wars of their chieftains, they were of extreme value in skirmishing, covering the line of march, and for all the purposes served by Pandours, Croats, and Highlanders in modern warfare. The most famous among them are the Agrian chasseurs and the Macedonian archers, who may have formed together a corps of about two thousand men. There is hardly a battle in which they do not play a prominent part, and the devotion with which they fought is testified by the circumstance that the post of toxarch had to be filled afresh three times in one year. At the opening of the campaign it was held by Clearchus, Attalus being in command of the Agrianians. The strength of the other light troops, usually known by the general designation of Thracians, was five thousand men, under the command of the Thracian prince Sitalces.