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I second the Hellenistic Army of Mithridates. Those troops would be most versatil to use. The Hellenistic Armament was used by all the Mediterrean Armies of the Koine like Carthage, all Hellas, the Eastern realms, the Seleucids and the Hellenistic Egyptians/Ptolemaic Armies.
What sets would be needed to represent these troops?
1. Sarissa Phalanx - maybe two combat sets (one western in Tunica, the Eastern with trousers?), marching and before.
2. The troops on the wings: Hypaspisten, Thureophoroi, Thorakitai, Immitation Legionaries
This is about the time Israel came under Roman control. Perhaps some Israelites would make a good set. If not for this period then some Zealots to fight the Imperial legions would be nice.