1. Caused the British to panic; which it shouldn't have, as they went thru that VERY SAME situation in 1914-1918 (WWI). One would think that a nation that experienced such a strategy, would be experienced enough to deal with it the second time. 2. Caused the creation of American Built CVE's (Carrier Lighter than Air Escort-Escort Carriers). These became hunter-killers in the Atlantic (for the small proportion of escort carriers allotted to the Atlantic) of enemy subs. 3. Caused the creation of DE (Destroyer Escorts)...again US built. These were to hunt down enemy subs as they performed their escorts across the Atlantic. DE's were simply baby Destroyers...smaller ships, smaller guns, smaller crews, easy, quick, and cheap to build.
Yes
During World War 2, it is reported that over 2,000 variants of Japanese Submarines were used during World War 2. Out of this, it is estimated that 10,000s were likely to be used during WW2.
326
Wolfpack
Underseaboats.U-boats
Both sides, the Allies and the Axis, had submarines when WW2 started.
The British lost 76 submarines during WWII.
Underseaboats.U-boats
52
759
9
They were used extensively throughout the war - from beginning to end.