The Nephites now prepare for an attack. This attack was apparently going to be a full scale attack because they get rid of their prisoners and excess provisions. They do not want to be concerned with any kind of Lamanites at their back, and so the prisoners are sent to Zarahemla as the prisoners from the prisoners from the army of Antiparah had been after their defeat by Helaman and the army of Antipus.
The provisions apparently were not needed for the short term sustenance of the seiging army. They were sent to Judea, which was the home base for this army. The army would either return there victorious, or in sore need of recuperation.