I kinda feel bad for the poor fella but at least it's the chicken doing it and not you hurting him! Lol besides, a predator or car could easily do the same, it's natural. :P
Anyhow, this may sound absolutely CRAZY but clearly the crows are there for a reason. Clearly there is something keeping...
I'd be careful about saying you won the war just yet, you.may jinx it and they may just come back next year withan even bigger army! :P
But seriously though for now it's great they moved on :)