When Ferdinand Graf von Zeppelin's rigid airship LZ 1 flew over Lake Constance in 1900, it was the most advanced and impressive flying machine in the world: a colossal, lighter-than-air craft capable of controlled flight. In World War I, Zeppelins were first used in a reconnaissance role, but on January 19, 1915 Kaiser Wilhelm II authorized their use in bombing strategic targets in England.
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