Wars are won by pushing the other side past they're own mental and physical breaking limit. That's it. Even if everyone person in the country in question was completely dedicated and willing to die for the cause, there is still a breaking point. Japan reached theirs with a couple of bombs. And Vietnam might have met theirs if we dropped a couple more. Case in point, a shorter war is a better war. And if it takes atrocities most people consider unbearable, so be it. Your not the soldier that had to perform them.
And restrictions don't win wars. For example, in the cold war, if neither side could have matched the others in terms of nuclear firepower, then one side would eventually fire.
And restrictions don't win wars. For example, in the cold war, if neither side could have matched the others in terms of nuclear firepower, then one side would eventually fire.