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        Zeppelin Ascending | The Evolution of Military Aviation

        circa 1915: A German Zeppelin ascending from its base for a raid on London. During World War I the Germans carried out 12 airship raids on London and many aeroplane attacks, killing some 530 people. Zeppelins were shown to be vulnerable, however, when British airmen successfully shot down several in flames. (Photo by Hulton Archive/Getty Images)

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