Hill Amnihu was a hill east of the river Sidon, which ran by the land of Zarahemla. In 87 B.C. the Amlicites — followers of Amlici, who had sought to be made king against the voice of the people and then took up arms against the Nephites — came upon the hill and began to make war. Alma2, the chief judge and governor, led the Nephite armies against them, and the fighting on the hill was hard, with many Nephites falling before the Amlicites (Alma 2:15-17).
The Lord strengthened the Nephites, who routed the Amlicites and pursued them through the day; 12,532 Amlicites and 6,562 Nephites were killed. Alma camped his army in the valley of Gideon, and his spies found that the fleeing Amlicites had joined a Lamanite host in the land of Minon, above Zarahemla, advancing on the city. The Nephites marched back toward Zarahemla and met the combined force as they crossed the river Sidon. Alma killed Amlici in single combat and drove back the Lamanite king’s guards, clearing the west bank so his people could cross. The Lamanites and Amlicites then fled and were pursued west and north into the wilderness of Hermounts (Alma 2:15-37).