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  2. Black May (1943) - Wikipedia

    en.wikipedia.org/wiki/Black_May_(1943)

    In May 1943, U-boat strength reached its peak, with 240 operational U-boats of which 118 were at sea, yet the sinking of Allied ships continued to decline. [2] May 1943 also had the greatest losses suffered by U-boats up to that time, with 41 being destroyed, 25 per cent of the operational U-boats. [3]

  3. List of submarine actions - Wikipedia

    en.wikipedia.org/wiki/List_of_submarine_actions

    1943, March 16–19 – The largest North Atlantic U-boat wolfpack attack of the world wars sinks 22 ships from Convoys HX 229/SC 122. 1943, April 29 – May 6 – Convoy ONS 5 is the last major North Atlantic wolfpack attack by surfaced U-boats as escorts demonstrate effective use of radar to sink 6 U-boats in low-visibility conditions.

  4. Mediterranean U-boat campaign of World War II - Wikipedia

    en.wikipedia.org/wiki/Mediterranean_U-boat...

    The Royal Navy boarded the sinking U-boat and recovered German code documents before U-559 sank. [38] The Second Battle of El Alamein prompted a concentration of U-boats in the western Mediterranean, in anticipation of Allied amphibious invasion. Five U-boats made contact with Operation Torch convoys, and two wolfpacks assembled near the ...

  5. Battle of the St. Lawrence - Wikipedia

    en.wikipedia.org/wiki/Battle_of_the_St._Lawrence

    U-boat losses experienced by the Kriegsmarine during 1942 following the entry of the United States Navy into the Battle of the Atlantic, coupled with declining German shipbuilding capability to replace battle losses, saw the U-boat fleet redeployed to the primary Atlantic convoy routes to disrupt the Allied war resupply effort; this effectively ...

  6. ON/ONS convoys - Wikipedia

    en.wikipedia.org/wiki/ON/ONS_convoys

    Eight ships were sunk, and one U-boat damaged, over a four day battle [4] Convoy ON 92 lost seven ships over a three-day period; Convoy ON 122 was the first to illustrate the defensive value of HF/DF and type 271 centimeter-wavelength radar. [5] Convoy ON 127 was the only North Atlantic trade convoy of 1942 or 1943 where all U-boats deployed ...

  7. Convoy battles of World War II - Wikipedia

    en.wikipedia.org/wiki/Convoy_Battles_of_World_War_II

    Convoy Battles of World War II occurred when convoys of warships protected cargo ships assembled for mutual defense and were attacked by submarines, surface ships and/or aircraft. Most were in the North Atlantic from 1939 to 1943 and involved attacks by U-boat wolfpacks .

  8. German submarine U-47 (1938) - Wikipedia

    en.wikipedia.org/wiki/German_submarine_U-47_(1938)

    German submarine U-47 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine during World War II. [1] She was laid down on 25 February 1937 at Friedrich Krupp Germaniawerft in Kiel as yard number 582 and went into service on 17 December 1938 under the command of Günther Prien.

  9. Gulf of Finland U-boat campaign - Wikipedia

    en.wikipedia.org/wiki/Gulf_of_Finland_U-boat...

    On 15 July 1944, U-679 was attacked by small Soviet boats: during a gunnery battle, the motor torpedo boat TK-57 suffered damages and two of her torpedoes barely missed the submarine. U-679 fled under cover of Finnish ground artillery. On 18 July 1944, U-479 damaged the Soviet submarine chaser MO-304 (later repaired).