《史记·七十列传·白起王翦列传》
廉颇固守营垒，采取防御态势与秦军对峙，秦军屡次挑战，赵兵坚守不出。
廉颇坚壁以待秦，秦数挑战，赵兵不出。
Lian Po firmly defended the camp, taking a defensive stance against the Qin army. The Qin army challenged them repeatedly, but the Zhao soldiers refused to come out.