[I was curious how many U-Boats Hitler had in WW2. It turns out the fleet was much bigger and better run than in WW1. This amazing fleet of craft almost won WW2 for Hitler. They were the single arm that nearly won the entire war. 30,000 German technicians and sailors made up this amazing arm. Their ability to sink ships was insane. Can you believe that only 1,100 German submarines … nearly defeated the British and the Americans! If it wasn't for Jewish America that came to save Jewish Britain, the Germans would have won outright. They did amazingly well. I did not know that the U-Boats at one time operated even in the Indian ocean. Jan]

The Armistice terms of 1918 required Germany to surrender all its U-boats, and the Treaty of Versailles forbade it to possess them in the future. In 1935, however, Adolf Hitler’s Germany repudiated the treaty and forcefully negotiated the right to build U-boats. Britain was ill-prepared in 1939 for a resumption of unrestricted submarine warfare, and during the early months of World War II the U-boats, which at that time numbered only 57, again achieved great successes. The first phase, during which the U-boats generally operated singly, ended in March 1941, by which time many merchant ships were sailing in convoy, trained escort groups were becoming available, and aircraft were proving their effectiveness as anti-U-boat weapons. In the next phase the Germans, having acquired air and U-boat bases in Norway and western France, were able to reach much farther out into the Atlantic, and their U-boats began to operate in groups (called wolf packs by the British). One U-boat would shadow a convoy and summon others by radio, and then the group would attack, generally on the surface at night. These tactics succeeded until radar came to the aid of the escorts and until convoys could be given continuous sea and air escort all the way across the Atlantic in both directions. In March 1943, as in April 1917, the Germans nearly succeeded in cutting Britain’s Atlantic lifeline, but by May escort carriers and very-long-range reconnaissance bombers became available. After the U-boats lost 41 of their number during that month, they withdrew temporarily from the Atlantic.

U-boat

In the next phase, U-boats were sent to remote waters where unescorted targets could still be found. Although at first they achieved considerable successes, especially in the Indian Ocean, the Allied strategy of striking at the U-boats’ supply vessels and putting all possible shipping into convoys again proved successful. In the final phase the U-boats—then fitted with the snorkel (schnorkel) ventilating tube, which permitted extended underwater travel and greatly reduced the effectiveness of radar—returned to the coastal waters around the British Isles, but they sank few ships and themselves suffered heavy losses.

In World War II Germany built 1,162 U-boats, of which 785 were destroyed and the remainder surrendered (or were scuttled to avoid surrender) at the capitulation. Of the 632 U-boats sunk at sea, Allied surface ships and shore-based aircraft accounted for the great majority (246 and 245 respectively).

Source: https://www.britannica.com/technology/U-boat

Virus-free. www.avast.com