Severed Arms at Sebus are the arms “smitten off by the sword of Ammon” from men who sought to slay him while the king’s flocks were being watered (Alma 17:39).
After Ammon drove the attackers afar off, the servants returned the flocks to the king’s pasture and went to the king bearing the severed arms. The arms were carried in unto the king “for a testimony of the things which they had done” (Alma 17:39).