The implications of Ammoron’s offer to exchange prisoners, and his ultimate withdrawal from Antiparah (as seen in verses 1–5), were that the Lamanite supply lines had become an issue. Perhaps Helaman and the other captains learned from that example, and when they prepare to retake the city of Cumeni, they surround it prior to the time that it would have received new provisions.
In contrast to the limited supply lines of both new personnel and food for the Lamanites in Cumeni, Helaman’s forces were able to receive six thousand new soldiers, and sixty more of the sons of the Ammonites. In addition to personnel, they received provisions. The Lamanites were besieged, and the Nephites had the advantage of being closer to their own lands and had more open supply lines. They used that advantage at Cumeni.