Why do floods occur frequently in the Yellow River in China? | Eng Sub 

In this episode, we came to Kaifeng, the ancient capital of the eight dynasties.
However, looking at the 13 chapters of the military classics, Sun Tzu's Art of War, there are fire attack chapters, but there is no "water attack chapter". Why?
-----------------------------
This film provides 3 external subtitles, click the "CC" button to turn on, or set:
1. Simplified Chinese
2. Traditional Chinese
3. English