《三国志·吴书·吴主传》
夏四月，大赦天下，孙权诏令各郡县修整城墙，修建谯楼，开挖壕沟，挖建水渠，以防备盗贼。
夏四月，大赦，诏诸郡县治城郭，起谯楼，穿堑发渠，以备盗贼。
In the fourth month of the summer, a general amnesty was granted, and Sun Quan ordered the various counties to repair their city walls, build watchtowers, dig moats and canals, in order to guard against bandits.