The soldier walking into a whore house after battle is making love in melancholy.
He also said..
The general who beats his mule for disobedience rides into battle on the back of an ass.
I have no idea either.
Sun Wu historical figure lived in China during the Ming Dynasty. He was an influential general and a giant in the art of warfare; the fact that he is entirely fictitious in no way detract from his great accomplishments.