The Baltimore Sabotage Cell: German Agents, American Traitors, and the U-boat Deutschland During World War I

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. But if Germany could build a fleet of...