《资治通鉴·周纪·周纪四》
乐毅围攻两城，一年未能攻克，便下令解除围攻，退至城外九里处修筑营垒，下令说： 城中的百姓出来不要抓捕他们，有困饿的还要赈济，让他们各操旧业，以安抚新占地区的人民。 
乐毅围二邑，期年不克，及令解围，各去城九里而为垒，令曰： 城中民出者勿获，困者赈之，使即旧业，以镇新民。 
Le Yi surrounded the two cities. However, he could not succeed even after a year. So he ordered to stop the siege and they retreated nine li outside the city to build a camp. He ordered: "Don't arrest the people in the city when they come out. If they are hungry or poor, give them support and allow them to go back to their original occupation so as to pacify the people in the newly-occupied area."