Alma 2:34
Alma and his army did not stop fighting after they cleared their side of the river. They pressed on to the other side with the intent to clear the Lamanites and Amlicites out of all their land. They were not going to settle for a little encroachment and hope it stopped at that. When they had all reached the west side of the river, the Lamanites began to flee before them with the Amlicites, despite the fact that they still had an awesome numerical advantage over the Nephites. Numbers don’t add up too much when set against the power of God.