《北史·列传·卷二十九》
杨谅派赵子开率军十余万，修筑险绝的道路，屯据在高壁，布下五十里大阵。
谅遣赵子开拥众十余万，筑绝径路，屯据高壁，布阵五十里。
Yang Liang sent Zhao Zikai to lead over 100,000 troops to build dangerous roads, stationing himself at Gaobi and setting up a large formation for 50 li.