Then the Hyphasis (Beas) was reached, and here the Macedonian army refused to go any farther.
It was a son of this usurper who was reigning at the time of the invasion of Alexander the Great; and the conqueror, when his advance was arrested at the Hyphasis (326 B.e.), meditating an attack on Pataliputra (the Palimbothra of the Greeks), was informed that the king of Magadha could oppose him with a force of 20,000 cavalry, 200,000 infantry, 2000 chariots, and 3000 or 4000 elephants.
Crossing the Hydaspes (Jhelum) he defeated Porus in a great battle, and crossing the Acesines (Chenab) near the foot of the hills and the Hydraotes (Ravi), reached the Hyphasis (Beas).
The Beas, which was the Hyphasis of the Greeks, is one of the Five Rivers of the Punjab.