This list covers the north-western mountain border tribes of India, such as the Assakenoi and Paropamisidae, from their first appearance until their incorporation into Greek Bactria. Their best troops were javelin-armed light horse, those of the Paropamisidae being brigaded by Alexander with Arachosians. Foot used a long spear or a bow against Alexander’s Macedonians, but climbed hills when overmatched and were out-shot by his archers. Indian mercenary guildsmen are described by Diodorus and Nearchos as tough opponents armed with javelins, heavy sword and long narrow hide shield. References: Armies of the Macedonian and Punic Wars D. Head, History of Alexander and Indica Arrian.
— Mountain Indian Army 500 BC - 170 BC
I/43 — KIMMERIAN, SKYTHIAN & EARLY HU 750 BC - 70 AD
I/60 — EARLY ACHAEMENID PERSIAN 550 BC - 420 BC
II/1 — REPUBLICAN INDIAN 500 BC - 321 BC
II/15 — ALEXANDRIAN IMPERIAL 328 BC - 321 BC
II/19 — SELEUCID 320 BC - 64 BC
II/2 — MOUNTAIN INDIAN 500 BC - 170 BC
II/36 — GRAECO-BACTRIAN 250 BC - 130 BC & GRAECO-INDIAN 170 BC - 55 BC
II/3 — CLASSICAL INDIAN 500 BC - 545 AD