By the summer of 1915 Germany was faced with two major problems in fighting World War I: how to break the British blockade and how to stop or seriously disrupt the British supply line across the Atlantic. The solution to the former was to find a way over, through, or under it. Aircraft in those days were too primitive, too short range, and too underpowered to accomplish this, and Germany lacked the naval strength to force a passage through the blockade...
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