However, Alexander's troops refused to face the vastly superior imperial army of Magadh Empire, Persoi refused to go beyond the Hyphases (Beas) River near modern-day Jalandhar. The Battle with Porus depressed the spirits of the Macedonians, as too many valiant comrades died helplessly by Porus' war elephants, and made them very unwilling to advance farther into India. Moreover, when they learned that a vastly superior imperial army of Magadh, Gangaridai and Prasii are waiting for the Greeks, all the generals of Alexander refused to meet them for fear of annihilation. Therefore, Alexander had to return.