@CS
This is not there in siman 81.
Mainly, your reading in those words that Mashiach need not fight physical wars, rather only spiritual wars, is not there at all. Was Dovid against Goliyas a spiritual war. Where do you see it there?
(Agav, I am not understanding why a slingshot is not Klei zayin, and what was Yehonasan’s involvement there? But I did not see see the context there.