Alma 25:2

but they took their armies and went over into the borders of the land of Zarahemla, and fell upon the people which were in the land of Ammonihah, and destroyed them.

Instead, they took their armies to the land of Zarahemla. They attacked the people in the city of Ammonihah and destroyed them.

Instead, they took their armies north into Nephite territory, crossed into the borders of Zarahemla, and attacked the city of Ammonihah. They wiped it out completely.