"But behold, every man that lifted his club to smite Ammon, he smote off their arms with his sword; for he did withstand their blows by smiting their arms with the edge of his sword, insomuch that they began to be astonished, and began to flee before him; yea, and they were not few in number; and he caused them to flee by the strength of his arm.
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 smitten 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." (Alma 17:37,39)

Myan, Egyptian, and North American parallels:
Raids and wars were an ongoing occurrence for the ancient Maya. Vases show both small raiding parties and large battles as well as the aftermath, with abject prisoners in the hands of the victors. In the first photo below a trio of warriors, carrying shields and spears, display amputated hands. They are the victims of war or personal combat.
On ancient Myan objects, severed hands have been seen in bowls(second photo below), or hanging from the eaves of houses or worn as ear ornaments.
The sketch in the third photo below represents how the Egyptians would count the severed hands of enemy corpses after a battle. They would usually cut of the hands and other body parts and make a heap before their king.
Archeological excavators studying the scalping practices of North American Indians report that victims were mutilated and dismembered, and many of their hands and feet appear to have been removed and taken as trophies. This custom has been documented historically for certain Native American culture groups in the United States. (Gregg, et al Gregg 1981 Plains Anthropologist 26(94):287-300) (Friederici, Georg 1907 Scalping In America. Smithsonian Institution Annual Report 1906 Pp. 423-438).

. Myan warriors with amputated hands

Bowls containing severed hands

Egyptians assembling a pile of severed hands and Swords with obsidian blades being used to cut off hands in a drawing from the sixteenth-century Florentine Codex