Winston Churchill with a jowl or two flatteringly removed, a fierce group of women in pinnies marching out under the banner "Up housewives and at 'em!" to recycle their domestic waste into "planes, guns, tanks, ships & ammunition", and a startling image of the assassination in 1942 of a Nazi officer are among hundreds of images of propaganda and war art from the National Archives in a free Wikimedia online gallery launched this week.

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