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U-Boat
Guerre de Course, merchant warfare.
109 ships of 593,864 tons in Atlantic
During WW1, German U-boats (submarines) used torpedoes to sink boats and ships belonging to the Allies or any vessel aiding the Allies war cause.
German submarines blockaded Britain and attacked U.S. ships.
food to the central power
In convoys, many ships sailing together protected by warships to hunt for German U-boats (submarines)
War material.
They were at war with each other.
'42-'44
There were no surface ships in a U-boat wolf pack. (The submarines, like American subs, were called, "Boats".) The smallest wolf packs were 2 to 4 submarines, while the largest wolf packs could contain up to 20 submarines. The size of the wolf packs always depended on what their commander, Karl Doenitz wanted them to do.
'42 thru '44.
To stop supplies from reaching England
U-Boat
Whenever they became a target of opportunity.
it was called U-boat
When ever they were presented with targets of opportunity.