After all, German u-boats had killed more U.S. sailors in the north Atlantic than died at Pearl Harbor.
But there was another and shorter route to this area available to the u-boats.
It was the belief that the destroyer had sunk one of the u-boats.
The u-boats, it is true, would have to travel further if they were to work in European waters.
My own notion of it is that the u-boats have many of us bluffed.
American citizens landed from vessels sunk by German submarines tell remarkable tales of the strenuous exploits of the u-boats.
It was all interesting—the life in Paris—but it had nothing to do with u-boats.
"u-boats thick last night, sir, and the convoy must 'a' got orders to disperse or else change course," he said to the doctor.
By this time the lurking u-boats had been dealt with in a most effective way.
The seamen are numbered in their tens of thousands, the u-boats in their tens.
1916 (said to have been in use from 1913), partial translation of German U-Boot, short for Unterseeboot, literally "undersea boat."