Caltrop - Wikipedia

Caltrop, Cube Combination Wiki

Caltrops, Bloons Wiki

Which weapon dominated the most in ancient times? - Quora

What was the most common metal used in tools, weapons and armour during the ancient times? - Quora

File:Ming exploding caltrops (1).jpg - Wikipedia

File:Caltrop 17 CPK.jpg - Wikimedia Commons

What are the best weapons from ancient times to modern times (including future)? - Quora

Boiled Water Chestnut Recipe - Simple Chinese Food

sling bullets

File:Caltrop tfc.png - Official TF2 Wiki