《资治通鉴·汉纪·汉纪十》
后来，秦始皇又调集全国成年男子去戍守北河，军队暴露在外十多年，死者多得无法统计，终究不能越过黄河占领北部地区，这难道是因为兵力不足、装备不齐吗？
然后发天下丁男以守北河，暴兵露师十有馀年，死者不可胜数，终不能逾河而北，是岂人众不足，兵革不备哉？
Later, Emperor Qin Shi Huang again called up all the adult males in the country to guard the northern river. The army stayed out for more than ten years, and the dead were so numerous that they could not be counted. After all, why could they not cross the Yellow River to occupy the north?