No specific number. Number varied depending on the situation...
During World War Two: When German U-Boats (submarines) concentrated in an attack against British & American convoys in the North Atlantic or Arctic Oceans, these groups of U-Boats were often called "wolf-packs" in english. The size of the wolf-pack would vary depending on the number of U-Boats actually available in the area at that time. The number could be anywhere from 2 to maybe 20 at the most. Actual historical records of U-Boat attacks & deployments could probably be used to determine a more accurate picture of how many German U-Boats attacked each individual convoy.
Close to a thousand during WWII.
In civilian ships alone, the figure was in the thousands. <><><> During WW II, German U-Boats sank 175 Allied warships; 2,825 merchant ships
U- Boats sank the Lusitania which brought the USA into the war. this caused a huge change in the progress of the war
thousands
U-Boats are submarines. Surface raiders would be warships (primarily battle-cruisers, pocket battleships, battleships & heavy cruisers) and disguised armed merchant ships (Q-ships).
3-11 u-boats
Which boats do you mean, there were many but im guessing you was looking for German U-Boats?
zero
Close to a thousand during WWII.
Two or more formed a pack.
The iPad has traveled on thousands of airplanes, cars, trains, boats and skateboards. It has been to every continent in every season. It has not been to the moon, however.
In civilian ships alone, the figure was in the thousands. <><><> During WW II, German U-Boats sank 175 Allied warships; 2,825 merchant ships
0
Including operational losses about 217.
Hundreds of boats were destroyed in the invasion. The Higgins boats, each carrying a platoon from ships to the beaches were small an built of wood, German machine guns destroyed many of them.
4800 men on the ships
Two or more.