《后汉书·列传·南匈奴列传》
使用强劲的弓弩，登越城墙，凭藉牢固的营垒进行坚守，等待敌人衰弱，这是中原士卒的擅长但却是戎狄的短处。
强弩乘城，坚营固守，以待其衰，中国之所长，而戎狄之所短也。
Using strong crossbows, climbing over the city wall, relying on strong camps to defend, waiting for the enemy to weaken. This is what the Central Plains soldiers are good at but what Rongdi is not good at.