庞涓
In 341 BC, troops under the general Sun Bin of the state of Qi faced battle with the forces of the state of Wei. Knowing that Wei regarded the army of Qi as inferior and cowardly, Sun Bin decided to use Wei's perception to his advantage. When Qi's forces invaded Wei, Sun Bin ordered them to light 100,000 camp fires on the first night. On the second night, they lit 50,000. On the third, 30,000. Sun Bin's deception caused the Wei forces led by general Pang Juan to believe Qi faced mass desertions. Rushing to attack what they believed to be an inferior army, the Wei forces assaulted Qi's troops at a narrow gorge, not knowing Sun Bin's soldiers had prepared it as an ambush site. When Pang Juan's troops reached the gorge they observed that a sign had been posted. Lighting a torch to see the message, the Wei commander read "Pang Juan dies beneath this tree". The lighting of the torch was the signal for Qi to initiate the ambush. Sun Bin's army quickly routed Pang Juan's and Pang Juan committed suicide.