In verse 47, Helaman had noted that the young men’s mothers had promised them that if they were faithful, then they would be preserved. In verse 56 he declares that their promise held true. None of the young men had died.
Perhaps to Helaman’s surprise, but certainly to his pride in these young men, they had fought well and hard, and had been instrumental in not only a victory, but turning a defeat into a victory.
The prisoners were gathered together and sent to the land of Zarahemla, or to the land around that city. This appears to have been a standard practice (see Alma 57:11).
Helaman’s letter continues in the next chapter of our modern edition. There was no chapter break at this point in the 1830 edition.