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The name U-boat was applied to German submarines.
'U-boats' was the name given to German submarines in both the first and second world war.
Yes, German submarines were very effective in both world wars. The Germans built excellent submarines and still do.
Atlantic Ocean.
Wolfpack
Underseaboats.U-boats
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A German submarine used in WW I was called a U-boat.
U-Boat , ULTRA ,U-boat, the name for German submarines during World War 2
Submarines, commerce raiding.
U-boats. (German submarines)
Oilers then merchantmen.