Alma 2:15

And it came to pass that the Amlicites came up upon the hill Amnihu, which was east of the river Sidon, which ran by the land of Zarahemla, and there they began to make war with the Nephites.

The Amlicites came to the hill Amnihu. This was east of the river Sidon. The river ran by the land of Zarahemla. They started to fight the Nephites there.

The Amlicites marched up to the hill of Amnihu, east of the Sidon River near Zarahemla. There they launched their attack on the Nephites.