A German submarine used in World War I or World War II.
- This approach would be similar to that adopted to fight German U-boats in the Second World War.
- The Royal Oak, a Royal Navy flagship, was sunk by a German U-boat in Scapa Flow off Orkney near the start of the second world war.
- Six months after Pearl Harbor, U-boats landed eight German marines on American shores for sabotage missions.
Word War I: from German U-Boot, abbreviation of Unterseeboot 'undersea boat'.
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