Alma 52:12

Now the king (Ammoron,) had departed out of the land of Zarahemla, and had made known unto the queen concerning the death of his brother, and had gathered together a large number of men, and had marched forth against the Nephites, on the borders by the West Sea;

King Ammoron had left the land of Zarahemla. He had told the queen that his brother had died. He had gathered many men. He had marched against the Nephites along the coast by the West Sea.

King Ammoron had left the land of Zarahemla and informed the queen about his brother’s death. He’d gathered a large army and marched against the Nephites along the western seacoast.