Battle of Gaugamela main Persian infantry was poorly trained and equipped in comparison to Alexander's pezhetairoi and hoplites. The only respectable infantry Darius had were his 2,000 Greek hoplites and his personal bodyguard, the 10,000 Immortals. The Greek mercenaries fought in a phalanx, armed not with a heavy shield but with spears no longer than three metres, while the spears of the Immortals were two metres long. Among the other Persian troops, the most heavily armed were the Armenians, who were armed the Greek way and probably fought as a phalanx. The rest of Darius' contingents were much more lightly armed; the main
Peltast and may have been a common type in Central Europe. The shield could be carried with a central strap and a handgrip near the rim or with just a central hand-grip. It may also have had a carrying strap (or "baldric") as Thracian peltasts slung their shields on their backs when evading the enemy. Peltasts' weapons consisted of several javelins (), which may have had to throw straps to allow more force to be applied to a throw. In the Archaic period, the Greek martial tradition had been focused almost exclusively on the heavy infantry, or hoplites. The style of