The Classical Ancient period for the Western World was dominated by the struggle between the Greek City States and the Persian Empire. For millennia the major powers in the region had been the great empires of Mesopotamia but a shift of power to the Mediterranean was seen during this period.
City-states like Sparta, Athens, Thebes and Corinth fought each other as well as the Persians throughout this period, until the Macedonians under Phillip and his son, Alexander the Great, unified the bulk of the Greek states and went on to conquer the Persian Empire. Alexander created an empire of his own that stretched from the Black Sea to Egypt and from Turkey to Western India. On his death, the empire fragmented into a number of Successor States ruled by Alexander's generals. Greek armies consisted largely of armored hoplite spearmen, with a small number of light infantry and cavalry. Macedonian armies are initially built around pikemen and heavy cavalry but as the empire grew so did the range of troops used.
The sprawling Achaemenid Empire covered an area from the Black Sea to Egypt and from Turkey to Western India. They were in regular conflict with the Greeks, usually over Greek support for the ethnically Greek city-states of Western Turkey, but were happy to incorporate Greek mercenaries in their armies. Achaemenid armies were massive and relied primarily on archers and good cavalry but incorporating a huge range of different troops. This range is one Pendraken's oldest and is due to be replaced at some point in the near future.
Indian states tend to enter Western History when Alexander the Great meets and defeats the army of Porus, but Indian states had been at war with each other long before that. Indian armies tend to be a mix of archers, two-handed swordsmen, chariots and elephants.