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28 December 1943 - The Battle of the Bay of Biscay was a naval action that took place on 28 December 1943 during World War II as part of the Atlantic campaign.
The 
Battle of the Bay of Biscay was a naval action that took place on 28 December 1943 during 
World War II as part of the 
Atlantic campaign. The battle took place in the 
Bay of Biscay between two light cruisers of the British 
Royal Navy, and a destroyer and a torpedo boat 
flotilla of the German 
Kriegsmarine hoping to intercept and escort a 
blockade runner. The battle was fought as part of the Allied 
Operation Stonewall which was to intercept German blockade runners off the west coast of France. In the confused action that followed the two British cruisers 
HMS Enterprise and 
HMS Glasgow respectively sank 
T26, together with her sister ship 
T25 and the destroyer 
Z27 

The Battle of the Bay of Biscay, 28 December 1943
Background
In late December 1943 a German 
Kriegsmarine destroyer flotilla, reinforced by six large 
Elbing-class torpedo boats were ordered to the Bay of Biscay in order to escort into a French port the 
blockade runners Osorno and 
Alsterufer which were carrying vital cargo from 
Japan. The Germans code named this Operation 
Bernau. The blockade runner 
Osorno reached the 
Gironde on 26 December, but struck a wreck in the estuary after being attacked by the 
RAF. She was beached and subsequently unloaded offshore. Meanwhile, 
Alsterufer, carrying 
tungsten (
Wolfram) and 
rubber, was still much further behind.

HMS 
Glasgow and 
Enterpriseshown together in 1942
Korvettenkapitän Franz Kohlauf sailed from 
Brest on the morning of 27 December with the torpedo boats 
T23, 
T24, 
T26 and 
T22. The 8th Destroyer Flotilla under 
Kapitän zur See Hans Erdmenger put out from the 
Gironde with destroyers 
Z24, 
Z37, 
Z32 and 
Z27, accompanied by two torpedo boats, 
T25, under the command of 
Korvettenkapitän Wirich von Gartzen, and 
T27.
The British Admiralty were also aware of the impending arrival of 
Alsterufer through the decryption of German 
Enigma messages at 
Bletchley Park and sent out dispatches to the nearest ships in the area for the interception. The closest ship, the light cruiser 
HMS Glasgow which had sailed from the 
Azores on 24 December was soon joined by 
HMS Enterprise. In support, but further away; 
HMS Mauritius had been ordered out from 
Gibraltar; 
HMS Penelope steamed past 
Lisbon; and 
HMS Gambia was in the Western Atlantic.
By 04:00 the next day the 4th Flotilla was 300 miles due south of 
Cape Clear, the 8th Flotilla standing to the south and were ready to meet 
Alsterufer. She was however nowhere to be seen, but the German flotillas were completely unaware that during the previous afternoon a 
B-24 Liberator bomber of 
No. 311 (Czechoslovak) Squadron RAF had attacked and set 
Alsterufer on fire. Abandoned by her crew, the ship was finished off by Liberators of 
No. 86 Squadron. This released the 
Glasgow and 
Enterprise, who were some 300 
nautical miles south-west of the German forces and were now steaming eastwards along the 
45th Parallel.
Just after midday, Erdmenger's 8th Destroyer Flotilla sighted Kohlauf's 4th Flotilla to the east, whereupon the torpedo boats turned east astern of the northernmost destroyers, taking station on their 
port side.
Battle

General map of the battle
Allied aircraft had already reported the position of the German ships about 1300. About the same time a lone German 
Focke-Wulf Fw 200 Condor sighted and attacked both cruisers only to be repelled by anti-aircraft gunfire. The German aircrew immediately turned north-east, reporting the position of the British cruisers more than half an hour later to Erdmenger. Captain Charles Clark on HMS 
Glasgow, assuming that he had been reported then also turned north-east, working around Erdmenger's position to intercept. The sea was becoming rougher and the wind had increased to 30 
knots, making sailing difficult for the destroyers and torpedo boats.
Sailing into rough seas and gale force winds, 
Glasgow sighted the destroyers at 1332 hours at a range of 16 miles. The two cruisers then intercepted at 
flank speed and altered course to cut the German ships off from their base.
[6] Soon after Clarke gave the order for 
Glasgow to open fire with her 
6-inch 'A' and 'B' turrets using her 
Type 273 radar for ranging. 
Enterprise opened fire a few minutes later. The two leading German destroyers however remained unscathed as shells splashed 100–150 metres from their targets. The Germans counter-attacked: 
Z23 launched six torpedoes, three from each bank of tubes, when the range was down to 17,000 metres, but missed. Both destroyers also opened up with their 
15 cm guns and their first shots fell only 200 metres over on Glasgow's port quarter. At about 1405 hours, a German shell hit 
Glasgow which exploded in 'A' boiler room, killing two members of the port 
pom-pom crew and wounding six others. 
Enterprise was continually straddled by near misses.

Sailors aboard HMS 
Glasgow clear cartridge cases ejected from the twin 
4 inch Mark XVI guns
By 1418 hours both of the German flotillas were involved in the fight. The 4th Torpedo Boat Flotilla attempted to attack with torpedoes a number of times but was frustrated by the heavy seas. 
Z32 and 
Z37 turned towards the cruisers, and closing to 12,800 metres, launched six and four torpedoes respectively as the cruisers continued to give heavy and accurate fire. The torpedo attack forced 
Glasgow to make an emergency turn to port as the track of one torpedo passed no more than thirty metres from her port quarter and two more near the port side. 
Enterprise had by this time separated from 
Glasgow and both acted independently.
[9] After the torpedo attack, the destroyers 
laid smoke and then retired back towards the flotilla line. The formation was as follows: 
Z32, 
Z24, 
Z37, 
T23, 
T27, 
T26, 
T22, 
T25, 
Z27 and 
Z25 while 
Z32 and 
Z37 being off to port in the course of their torpedo attack.
The German force then split up, whereupon 
Glasgow reversed course at 1435 hours to chase the northerly group of destroyers; 
Enterprise had already altered course to the west to head them off.
[9] The Germans then launched another torpedo attack but shortly after 
Z27 had fired hers, she received a shell hit from 
Enterprise which struck the boiler room, passing through an oil bunker which caused a huge fire. Clouds of steam gushed from her forward funnel as her speed fell off. After being hit she fired her second salvo of four torpedoes, but all missed.
Glasgow meanwhile concentrated on 
T25, which soon after sustained hits in the region of the 
aft torpedo tubes, the 
Flakvierling and the 
3.7 cm flak platforms, which killed or wounded all their crews. Then a second shell struck the German torpedo boat, which completely destroyed the mast as well as the funnel. 
T25 was now a sitting duck and requested 
T22 to attempt to come alongside and take off her crew. 
Glasgow shifted to 
T26, which was quickly 
bracketed by near misses. 
T22 had both cruisers on her port side, and, in an effort to drive them off while she closed in on her damaged consort, she fired her full spread of torpedoes and opened fire with her guns. The torpedoes passed harmlessly by their targets, and as 
T22 turned to starboard towards 
T25, she too was bracketed by near misses. 
T22 abandoned the rescue after suffering another hit, then laid smoke, fired her guns and withdrew to the south-west. 
T26 was still under fire and was soon severely hit in the boiler room, and as 
T22 laid smoke to screen her, the damaged ship signalled that she was sinking; 
T22 turned northwards and broke away.
[9]
The two cruisers reversed course, chasing and soon catching 
T26. Clarke ordered 
Enterprise to finish her off while he turned 
Glasgow north again to look for the other damaged German vessels, particularly 
T25. 
Glasgow soon came across not 
T25 but 
Z27, drifting and silent. Closing to 
point-blank range, 
Glasgow fired, hitting the destroyer's magazines. The hit caused a large explosion which killed Erdmenger, his staff and the captain. At the same time 
Enterprise finished off 
T26 with a single torpedo and then moved in for the kill on 
T25. The German ship's bridge and upper deck were a twist of metal and her after superstructure wrecked but she remained afloat. 
Enterprise closed to 3000 metres, firing her guns and then fired a torpedo; within minutes 
T25 was an abandoned, burning and sinking wreck.

A sketch from 
Z27 of 
T25 and 
T26 being shelled during the battle (
National Maritime Museum of Ireland)
Aftermath
The two British cruisers met up once more and, seeing no further signs of the German squadron and having accounted for three of them at no significant damage to themselves, withdrew toward 
Plymouth. They arrived on the evening of 29 December, low on both fuel and ammunition. 
Glasgow had received one hit that killed two crew members and wounded another three, while 
Enterprise had no real damage except for shell splinters.
The two German survivors, 
T22 and 
Z23, reunited and headed towards 
Saint-Jean-de-Luz near the Spanish border. The rest of the German ships headed back to the 
Gironde.
Only 283 survivors of the 672 men on the three sunken ships were rescued: 93 from 
Z27, 100 from 
T25 and 90 from 
T26. British and Irish ships, Spanish destroyers and German 
U-boats took part in the rescue. About 62 survivors were picked up by British minesweepers as prisoners. 168 were rescued by a small Irish steamer, the 
MV Kerlogue, and four by Spanish destroyers, and they were all 
interned. Morale for the German Navy was lowered even further when news filtered through of the battleship 
Scharnhorst being 
sunk in the North Cape marking a sour note to the end of the year for the Kriegsmarine.
As it turned out, 
Osorno was the last of the blockade runners to get through. Three other German blockade runners were sunk between 3 and 5 January 1944 by Allied patrols in the South Atlantic. The Germans thereafter ceased all surface blockade running and switched to movement by 
submarine; these became known as 
Yanagi missions.
https://en.wikipedia.org/wiki/Battle_of_the_Bay_of_Biscay