Shock and awe. You might remember that one. It is a (very old) military strategy, last used prominently by the US in the latest Iraq war.
One that aims at shell-shocking the enemy into submission with a tremendous load of boom and bang. With the hope that the evil witch will lose her favorite broom AND her spells, forget to recover, and just give up the ghost. So that this contentious and ugly conquering business turns out to be much less difficult and costly than it would otherwise be.