"Victory and defeat are common affairs for military strategists" comes from "The Biography of Pei Du in the Old Book of Tang Dynasty": "With one victory and one loss, military strategists are in constant power." Chapter 71 of "The Romance of the Three Kingdoms" by Luo Guanzhong of the Ming Dynasty: " Cao Cao said: "It is not He's fault. Victory or defeat is a common matter for military strategists. '"

Meaning: Victory or failure is a common occurrence for those who lead troops in battle. It means don't take a chance victory or failure too seriously.