It took my until 250 bc to have cavalry-only army. UNtil then, i manage to defend against the Seleucids using an army made up of FMs, Baktrian HA and phalanxes.
Afterwards, about 240-250 bc you should have Baktria, Kophen and 3 settlements in India, and two cavalry armies roughly between half stack and two thirds stack. Such two armies is perfectly enough defend your lands and expand, either against Seleucids, Pahlava or Saka Rauka.
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