These were led by a strong and mighty man named Zeniff. The story being referred to is found in Mosiah 9:1-4. Zeniff takes a group of people from their new home of Zarahemla back to the land of Nephi. Apparently, his memory was that the grass was considerably greener in the land of Nephi. After a violent contention along the way, the party turned back with only fifty surviving. On a second attempt, Zeniff and his followers were successful in settling in the land of Nephi. They become the people of king Noah and king Limhi who are eventually forced into slavery to the Lamanites. The entire story is contained in Mosiah 9-22.