Both men studied under
鬼谷子. Out of jealousy Pang had Sun Bin's kneecaps removed, and Sun Bin escaped to
齐. Qi beat Wei at
桂陵 and again at
马陵, where, the
史记 says, Sun Bin wrote on a tree
庞涓死于此树之下, 'Pang Juan dies beneath this tree'. When Pang lit a torch to read it, the Qi archers shot, and he killed himself.
