Two powerful kingdoms

East of Porus' kingdom, near the Ganges River, was the powerful Nanda Empire of Magadha and Gangaridai Empire of Bengal. According to the Greek sources, the Nanda army was five times larger than the Macedonian army. Fearing the prospects of facing the powerful Nanda Empire armies and exhausted by years of campaigning, his army mutinied at the Hyphasis River, refusing to march further east. This river thus marks the easternmost extent of Alexander's conquests.