1. The fire was a ploy to get Army B's attention. While Army B was busy putting out the fire, Army A had an opportunity to intrude into Army B.2. Army A created a diversion by starting a fire at Army B's camp so that Army A could attack the Army B's headquarter while Army B were putting out the fire.3. Every magic trick is about manipulation and misdirection.
 diversion misdirection ployploy 就是障眼法的一個計劃，也可以很簡單的用 plan 就好了，但不會那麼傳神
The thesis of your essay is completely obscured by your flowry language.