Events on this day

10 April

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This is a run-down from several databases on our site. It's meant to give a clear picture of events on this date, all year round.

U-boat Shipyard report

Ordered (57) Laid down (4) Launched (4) Commissioned (3)
1941: U-241, U-242, U-243, U-244, U-245, U-246, U-274, U-275, U-276, U-277, U-278, U-279, U-345, U-346, U-347, U-348, U-421, U-422, U-423, U-424, U-475, U-476, U-477, U-478, U-479, U-480, U-533, U-534, U-535, U-536, U-537, U-538, U-647, U-648, U-649, U-650, U-715, U-716, U-717, U-718, U-735, U-736, U-737, U-738, U-739, U-740, U-805, U-806, U-901, U-951, U-952, U-953, U-954, U-955, U-956, U-957, U-9581940: U-147, U-148
1942: U-312, U-537
1940: U-100
1941: U-85, U-132
1943: U-392
1941: U-401U-565
1943: U-741
These are commissioned boats. For more see our Shipyard pages.

Allied Ships hit on this date

 U-boatCommanderName of shipTonsCountryConvoy
 U-37HartmannSveaborg 9,076   sw
 U-37HartmannTosca 5,128   nw
 U-4HinschHMS Thistle (N 24) 1,090   br
 U-52SalmanSaleier 6,563   nlOB-306
 U-203MützelburgSan Delfino 8,072   br
 U-552ToppTamaulipas 6,943   am
 U-654ForsterEmpire Prairie 7,010   br
 U-85GregerChr. Knudsen 4,904   nw
* Unless otherwise noted the ships listed here were sunk. (d) = damaged

See all Allied ships hit by U-boats during WWII.

Attacks on this day


The target of the attack by the British destroyer HMS Hero on 10 April 1940 in position 62.54N, 01.56W, originally credited with sinking U-50, was almost certainly not a submarine. (1993-12-01, FDS/NHB)

U-2. 18.21 hrs, SW of Norway: a Wellington attacked the boat, dropping one bomb. No damage.


U-843. An attack by an American B-24 bomber from Squadron VB 107 (pilot Edward W. Krug) damaged the stern torpedo tubes. The boat abandoned planned operations off Cape Town and continued to the Indian Ocean, arriving at Jakarta on 11 June. (Blair, vol 2, page 537)

U-821. 0304hrs, Bay of Biscay, inbound: Liberator Mk.V BZ781 (53 Sqn RAF/A, pilot F/O W.J. Irving, RCAF) made a Leigh Light attack after following a radar trace. The depth charges failed to release on the first run, and on a further two passes, possibly due to flak hits to the bomb bay on the second approach. The undamaged U-821 escaped further strafing attacks by diving after 20 minutes. The Liberator was left with an inoperable tail gun turret and damage to the hydraulics and nose wheel. The damage was noticed, and F/O Irving managed to reach base and land without flaps or brakes at first light - for which he later received the DFC. (Franks/Zimmerman)

U-boats lost

1944: U-986 +, U-68
1945: U-878 +

157 men died when those 3 U-boats were lost on this date. 1 men survived.

Survivors from U-boats almost always landed in allied captivity.
U-boats marked with + were lost with all hands.

- For more information on U-boat losses check out our Fates section.

U-boat Men Lost or Wounded

There were no men lost from U-boats on this date, 10 April.

- For more information on Men lost from U-boats check out this page.

Personnel Information

The following men were born on this day:
Hans-Joachim Gutteck (1914), Fritz Henning (1917), Friedrich Justi (1919), Heinrich Mäueler (1920), Egon Reiner Freiherr von Schlippenbach (1914), Fritz Schneewind (1917).

The following men died on this day:
Bernhard Emde (1996), Karl-Heinz Fuchs (1990), Gerhard Groth (1997), Karl-Ernst Kaiser (1944), Albert Lauzemis (1944), Herbert Nollau (1968), Jürgen Quaet-Faslem (1971), Johannes Rodig (1945), Albert Sürenhagen (1945).

See the entire U-boat commander listing showing all U-boat commanders.
We might include more officers (Allied and Axis) at a later date.

U-boat departures and arrivals on 10 April

This section shows the U-boat departures and arrivals from bases on this day of the year. Current country names shown with harbour names. Boats entering port display days at sea during that patrol.


U-boats entering base:
To Wilhelmshaven, Germany: U-23 (2 days), U-24 (2 days)


From Kiel, Germany: U-75
From Lorient, France: U-123

U-boats entering base:
To St. Nazaire, France: U-46 (27 days), U-97 (22 days)


U-boats entering base:
To La Pallice U-332 (53 days)
To Lorient, France: U-124 (49 days)


From Feodosia, Ukraine: U-24
From Kiel, Germany: U-650
From La Spezia, Italy: U-97
From Lorient, France: U-175 (lost 8 days later), U-226

U-boats entering base:
To St. Nazaire, France: U-666 (45 days)


From Konstanza, Rumania: U-19
From Ramsund, Norway: U-1060

U-boats entering base:
To La Pallice U-212 (3 days), U-309 (3 days)
To Narvik, Norway: U-315 (19 days)


From Narvik, Norway: U-278

U-boats entering base:
To Kristiansand U-868 (28 days)

U-boats at sea on 10 April

Boats entering port on this day are not counted, but boats departing for patrol are. (+) indicates the boat was lost during this patrol.


U-2, U-4, U-5, U-6, U-7, U-9, U-10, U-13, U-14, U-19, U-25, U-30, U-34, U-37, U-38, U-46, U-47, U-48, U-49 (+), U-51, U-52, U-56, U-57, U-58, U-59, U-60, U-62, U-64 (+), U-65.
29 boats at sea.


U-38, U-52, U-69, U-73, U-74, U-75, U-94, U-98, U-101, U-103, U-105, U-106, U-107, U-108, U-123, U-124, U-552.
17 boats at sea.


U-66, U-68, U-71, U-81, U-83, U-84, U-85 (+), U-86, U-97, U-98, U-105, U-108, U-109, U-123, U-125, U-130, U-136, U-154, U-160, U-162, U-201, U-202, U-203, U-209, U-252 (+), U-331, U-333, U-334, U-352 (+), U-373, U-376, U-377, U-378, U-402, U-403, U-406, U-431, U-435, U-436, U-437, U-453, U-454, U-456, U-459, U-505, U-506, U-507, U-552, U-561, U-562, U-564, U-566, U-571, U-572, U-575, U-576, U-582, U-589, U-590, U-591, U-592, U-654, U-657, U-752, U-754, UA.
66 boats at sea.


U-24, U-67, U-68, U-71, U-84, U-86, U-97, U-105 (+), U-108, U-117, U-123, U-126 (+), U-128 (+), U-129, U-134, U-154, U-155, U-159, U-160, U-161, U-168, U-172, U-174 (+), U-175 (+), U-176 (+), U-177, U-178, U-180, U-181, U-182 (+), U-183, U-185, U-188, U-189 (+), U-191 (+), U-195, U-196, U-197 (+), U-198, U-203 (+), U-209 (+), U-226, U-229, U-251, U-255, U-257, U-258 (+), U-260, U-262, U-264, U-267, U-269, U-270, U-302, U-303, U-305, U-306, U-333, U-336, U-355, U-371, U-373, U-375, U-381 (+), U-382, U-404, U-409, U-413, U-414, U-415, U-438 (+), U-440, U-441, U-453, U-455, U-462, U-463, U-465, U-467, U-487, U-506, U-509, U-510, U-513, U-515, U-516, U-518, U-523, U-526 (+), U-527, U-530, U-532, U-552, U-563, U-564, U-565, U-571, U-572, U-584, U-586, U-590, U-592, U-593, U-594, U-596, U-598, U-602 (+), U-610, U-613, U-615, U-617, U-618, U-625, U-628, U-629, U-630 (+), U-631, U-639, U-641, U-646, U-648, U-662, U-706, U-711, U-732, U-755, U-954 (+).
127 boats at sea.


U-18, U-19, U-23, U-66 (+), U-92, U-123, U-129, U-154, U-155, U-170, U-178, U-181, U-188, U-190, U-196, U-214, U-218, U-255, U-262, U-267, U-311 (+), U-312, U-313, U-333, U-342 (+), U-354, U-361, U-362, U-365, U-385, U-448 (+), U-471, U-473, U-488 (+), U-505, U-518, U-532, U-537, U-541, U-543 (+), U-546, U-548, U-550 (+), U-552, U-565, U-596, U-621, U-636, U-667, U-672, U-703, U-716, U-736, U-739, U-740, U-741, U-765 (+), U-766, U-802, U-821, U-843, U-852 (+), U-859 (+), U-969, U-970, U-993, U-1060, U-1061, U-1062.
69 boats at sea.


U-190, U-218, U-245, U-249, U-278, U-285 (+), U-293, U-294, U-299, U-315, U-325 (+), U-326 (+), U-396 (+), U-427, U-481, U-485, U-486 (+), U-510, U-516, U-518 (+), U-530, U-532, U-541, U-546 (+), U-548 (+), U-636 (+), U-637, U-668, U-739, U-773, U-776, U-805, U-825, U-826, U-853 (+), U-857 (+), U-858, U-861, U-873, U-879 (+), U-880 (+), U-881 (+), U-889, U-956, U-978, U-979 (+), U-1009, U-1023, U-1024 (+), U-1055 (+), U-1063 (+), U-1107 (+), U-1202, U-1206 (+), U-1235 (+), U-1274 (+), U-1305, U-2321, U-2322, U-2324.
60 boats at sea.

General Events on 10 April


The following U.P. report was released to the newswires: Roars like the detonation of depth charges shook houses on the Kent and Sussex coast last night, leading channel coast dwellers to believe that a battle against U-boat was in progress. Heavy rolls of gunfire also came from the direction of Dunkirk.

The following A.P. report was released to the newswires: A Coast Guard Lieutenant said today that a United States cruiser on which President Roosevelt was returning from Yalta sailed almost directly over a German submarine in the Strait of Gibraltar. Lieutenant John F. Pival, of Detroit, told this story: "We were entering the Mediterranean, and knew that a U-boat was in the vicinity. About twenty bombers were criss-crossing the area while a lot of destroyers and anti-submarine ships were combing the area. "Our radio was tuned to the aircraft frequency and just as we started into the narrows a British pilot was heart do say, 'I see the beggar. Yes, that's him. He's diving. Here I go.' "However, the plane did not succeed in getting the submarine. "Just then one of our finest cruisers and her escort came steaming out of the Mediterranean, almost directly over where the submarine had been. "Upon arrival in Italy, we were startled to hear that the President was aboard the cruiser."

U-668 evacuated a weather team from Bear Island.


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