...you have absolutely no proof to offer that torture works, or has ever worked, much less been essential to "winning a war." I would lump in the acts of the partisans you mention as non-essential; certainly nice to have, but I ask the question again - if the Resistance had not been available to conduct their activities before the invasion of Normandy, would the Allies have cancelled OVERLORD? I think we both know the answer.
Your contention was that these activities were, and are, essential for victory, but you've not made a convincing case other than "because I say so."
I have no idea what your point is supposed to be regards the double-agents. I'm not denying the history behind it all may be interesting to some, but your exaggeration of their effects is at odds with the need to break international law or torture prisoners. You simply haven't proven that the Allies needed to do these things in order to win the war.