《三国志·蜀书·关张马黄赵传》
进退两难之际，就逃往汉中投靠张鲁，张鲁这人不值得马超与他共谋大事，马超心中郁闷，又得知刘备在成都围困刘璋，于是暗中派人送信，请求归降。
进退狼狈，乃奔汉中依张鲁。鲁不足与计事，内怀於邑，闻先主围刘璋於成都，密书请降。
Beset by difficulties, he fled to Hanzhong and sought refuge with Zhang Lu. Zhang Lu was not worthy of Ma Chao's plans for great deeds, and Ma Chao was depressed. He heard that Liu Bei was besieging Liu Zhang in Chengdu, so he secretly sent someone to deliver a letter and request his surrender.