the beas river marks the eastern-most border of alexander the great's conquests in 326 bce. it was one of the rivers which created problems in alexander's invasion of india. his troops mutinied here in 326 bce, refusing to go any further; they had been away from home for eight years. alexander shut himself in his tent for three days, but when his men did not change their desires he gave in, raising twelve colossal altars to mark the limit and glory of his expedition.