庞涓
In 354 BC, Wei state attacked the Zhao state, with Pang Juan leading the Wei army. They besieged the Zhao capital city of Handan. Zhao requested help from Qi, and the king of Qi commissioned Sun Bin and Tian Ji to lead an army to help Zhao. Sun Bin proposed the strategy of "besieging Wei to rescue Zhao" and the Qi army attacked the Wei capital city of Daliang (present-day Kaifeng), forcing the Wei army to turn back to save the city and effectively lifting the siege on Handan. The Wei army was ambushed and defeated by the Qi forces at the Battle of Guiling.