No rules of real war

Yes, I think using siege and total war was necessary. People claimed "this is violating the rules of war" but in my opinion, there are no true rules of war. Maybe setting fires on everything was a little over the top it still got confederates to leave and that upped the union chances of winning the war because of the lack of food supplies. The siege did affect the entire war because the union was able to take control of the Mississippi river. This cut off all supplies and recourses from the confederates.  This was basically payback for slave owners because slave owners treated their slaves worse then war treated them.