The event occurs before the play, and descriptions are given of how Macbeth killed him, but do we know WHERE it happened? From the information given, I've assumed it was at Macdonwald's own palace or castle; but then, that idea's thrown off by the Sergeant's description of how Macbeth "fixed his head upon our battlements." OUR battlements, he says - so is it the battlements of another castle? Thanks ahead of time for your thoughts...