After the British escaped at Dunkirk, because of his own "stop order" to his armoured units not to advance into the undefended city, Hitler told Martin Bormann he had purposely spared the British army so as not to create "an irreparable breach between the British and ourselves."
"The blood of every single Englishman is too valuable to be shed, our two people belong together racially and traditionally - this has always been my aim even if our Generals can't grasp it."
Page 326 - http://www.amazon.co.uk/Churchill-Hitler-Unnecessary-War-Britain/dp/030740515X/ref=sr_1_1?ie=UTF8&qid=1287603972&sr=8-1-catcorr
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Allies would have lost Second World War had Hitler used deadly nerve gas
New York, May 15 (ANI): As the D-Day anniversary approaches, a professor of chemistry and biochemistry at Canisius College in Buffalo, New York, Frank J. Dinan, has revealed what could have happened if Nazi dictator Adolf Hitler had used the deadly nerve gas Tabun.
According to Professor Dinan, had Hitler used Tabun, the Allies could have been forced back into the sea with enormous casualties.
http://news.oneindia.in/2010/05/15/allieswould-lost-second-world-war-had-hitler-used-deadlyn.html
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"I quite agree that it may be several weeks or even months before I shall ask you to drench Germany with poison gas, and if we do it, let us do it one hundred per cent."
Winston Churchill - July 6, 1944
http://www.fpp.co.uk/bookchapters/WSC/gaswar.html
"You must understand that this war is not against Hitler or National Socialism, but against the strength of the German people, which is to be smashed once and for all, regardless of whether it is in the hands of Hitler or a Jesuit priest."
Winston Churchill - 1940
http://books.google.co.uk/books?id=VBkkFXpaG0MC&lpg=PA15&ots=OmtkxQiXrS&dq=%22You%20must%20understand%20that%20this%20war%20is%20not%20against%20Hitler%20or%20National%20Socialism%2C%20but%20against%20the%20strength%20of%20the%20German%20people%2C%20which%20is%20to%20be%20smashed%20once%20and%20for%20all%2C%20regardless%20of%20whether%20it%20is%20in%20the%20hands%20of%20Hitler%20or%20a%20Jesuit%20priest.%22&pg=PA15#v=onepage&q=%22You%20must%20understand%20that%20this%20war%20is%20not%20against%20Hitler%20or%20National%20Socialism,%20but%20against%20the%20strength%20of%20the%20German%20people,%20which%20is%20to%20be%20smashed%20once%20and%20for%20all,%20regardless%20of%20whether%20it%20is%20in%20the%20hands%20of%20Hitler%20or%20a%20Jesuit%20priest.%22&f=false