Ancient Macedonian army at 4,500, asserting it was closer to 5,100 horsemen. The army led by Alexander the Great into the Persian Empire included Greek heavy infantry in the form of allied contingents provided by the League of Corinth and hired mercenaries. These infantrymen would have been equipped as hoplites with the traditional hoplite panoply consisting of a thrusting spear ("doru"), bronze-faced "hoplon" shield and body armour. In appearance, they would have been almost identical to the hypaspists. In battle, the Greek hoplites had a less active role than the Macedonian phalangites and hypaspists. At Gaugamela, the Greek infantry formed the defensive rear
Thracian language (meaning "up") and based on several Thracic items, would have meant "upon", "up", and "Utaspios" is theorized to have meant "On horse(back)", parallel to ancient Greek "ephippos (epi-hippos)". The early Indo-European languages had more than one word for horse; for example Latin had "equus" from PIE "*ekwo-" and "mannus" ("a pony") from another IE root, later receiving "cabalus" as a loanword. In many cases in current Thracology, there is more than one etymology for a Thracian lexical item. For example, Thracian "Diana Germetitha" ("Diana" is from Latin while the epithet "Germetitha" is from Thracian) has two different proposed etymologies, "Diana