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A Nephite dissident, Amlici, brought an army to battle the Nephites (Alma 2:17). This battle may have been intended primarily as a diversion, luring the Nephite army away from the capital city. The Amlicites hastily retreated southward, joined with a Lamanite army, and raced to attack the city of Zarahemla.
The hill is only mentioned in two verses: Alma 2:15,17.
References are from The Book of Mormon: Another Testament of Jesus Christ, translated by Joseph Smith, Jr.
(Salt Lake City, Utah: The Church of Jesus Christ of Latter-day Saints, 1981 [first edition, 1830]).