Gongsun Zan
Gongsun Zan, after recent military defeats in addition to a famine in his lands, decided to secure his supplies. He built a fortress, Yijing (易京; northwest of present-day Xiong County, Hebei), where he built many large towers on top of mounds where he and his generals lived. There were ten moats around the fortress and the towers had iron doors with huge grain supplies for Gongsun Zan to use to live out the civil wars in northern China. In doing so, Gongsun Zan let his armies away from his fortress fight for themselves thinking they would see the only option they had was to fight hard. Instead, the soldiers killed their commanders and surrendered or died easily while fighting.