Alma 17:39

And when he had driven them afar off, he returned, and they watered their flocks and returned them to the pasture of the king, and then went in unto the king, bearing the arms which had been smote off by the sword of Ammon, of those who sought to slay him; and they were carried in unto the king, for a testimony of the things which they had done.

When he had driven them far away, he came back. They watered their flocks and took them back to the king’s pasture. Then they went to the king. They brought the arms that had been cut off by Ammon’s sword from those who tried to kill him. They carried them to the king as proof of what they had done.

After he’d driven them far away, Ammon came back. They watered the flocks and returned them to the king’s pasture. Then they went to the king, carrying the severed arms—evidence of what had happened when those men tried to kill Ammon.