《明史·列传·卷一百六十九》
观将渔船十只编为一甲，令其分区巡查警戒，不到一月，盗贼不敢出没了。
观编十舟为一甲，令画地巡警。不匝月，盗屏迹。
 Wan Guan grouped ten fishing boats into one squadron and had them take turns patrolling the area, and in less than a month, the robbers didn’t dare to emerge.