More than 2,000 years ago, when various kingdoms were fighting for hegemony, the State of Zhao decided to attack the State of Liang, which was sandwiched between Zhao and Yan, in order to conquer the evenly matched State of Yan in one fell swoop. As a result, Liangcheng, which had only more than 4,000 women and children, was captured by Zhao. The country's 100,000-strong army surrounded him. In times of crisis, King Liang (Wang Zhiwen) asked the Mohists, who were famous for defending the city, for a military...