This article interprets Sun Tzu’s idea of building favorable strategic momentum via the Battle of Changping. Qin secured victory through diplomacy, logistics and psychological tricks before Bai Qi’s final strike, proving momentum shapes decisive wins.
Han Fei blames Qin’s ministers for three blunders: sparing collapsing Zhao, failing to take Handan, wasting strength. Now Qin is weak, rivals unite.