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| U-504 | Type IXC |
| Feldpost Number | M 45 926 |
| Construction Yard | Deutsche Werft AG, Hamburg-Finkenwärder |
| Yard Number | 294 |
| Ordered | 25th Sep 1939 |
| Keel laid | 29th Apr 1940 |
| Launched | 24th Apr 1941 |
| Commissioned | 30th Jul 1941 |
| Baubelehrung | Baubelehrung U-Boote Nordsee, Bremen /
Kriegsschiffbaulehrabteilung für Unterseeboote Nordsee, Bremen | | Training, Flotillas and Duties | | 07.41 - 12.41 | 4.U-Flottille, Stettin
Ausbildungsboot (under training)
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| 01.42 - 07.43 | 2.U-Flottille, Lorient
Frontboot (operational)
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| Commanders | | 30.07.41 - 05.01.43 | KK Hans-Georg Friedrich 'Fritz' Poske |
| 06.01.43 - 30.07.43 | KL Wilhelm Luis |
| Operations information for U-504 | 06.01.1942 - 20.01.1942
First Sailing - active patrol
U-504 left Kiel under the command of Hans-Georg Friedrich Poske on 6th Jan 1942 and arrived at Lorient on 20th Jan 1942 after two weeks.
| 25.01.1942 - 01.04.1942
Second Sailing - active patrol
On the 25th Jan 1942, U-504 left Lorient under the command of Hans-Georg Friedrich Poske and returned to Lorient on 1st Apr 1942 after nine and a half weeks on patrol.
Hans-Georg Friedrich Poske hit four ships on this patrol, one was from convoy OS-20.-
On 22nd Feb 1942 he sank the American 5,287 ton Republic.
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On 23rd Feb 1942 he sank the American 10,227 ton WD Anderson.
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On 26th Feb 1942 he sank the Dutch 8,245 ton Mamura.
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On 16th Mar 1942 he sank the British 2,802 ton Manaqui, sailing with convoy OS-20.
| 02.05.1942 - 07.07.1942
Third Sailing - active patrol
U-504 departed under Hans-Georg Friedrich Poske from Lorient on 2nd May 1942 and arrived back at Lorient on 7th Jul 1942 after nine and a half weeks on patrol.
Hans-Georg Friedrich Poske hit six ships on this patrol.-
On 29th May 1942 he sank the British 1,597 ton Allister.
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On 8th Jun 1942 he sank the British 1,512 ton Rosenborg.
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On 8th Jun 1942 he sank the 3,901 ton Tela.
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On 11th Jun 1942 he sank the Dutch 4,282 ton Crijnssen.
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On 11th Jun 1942 he sank the American 4,846 ton American.
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On 14th Jun 1942 he sank the 3,280 ton Regent.
| 19.08.1942 - 11.12.1942
Fourth Sailing - active patrol
U-504 left Lorient under the command of Hans-Georg Friedrich Poske on 19th Aug 1942 and returned over sixteen weeks later to Lorient on 11th Dec 1942.
Hans-Georg Friedrich Poske hit six ships on this patrol.-
On 17th Oct 1942 he sank the British 5,970 ton Empire Chaucer.
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On 23rd Oct 1942 he sank the British 5,669 ton City of Johannesburg.
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On 26th Oct 1942 he fatally damaged the American 7,176 ton Anne Hutchinson.
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On 31st Oct 1942 he sank the British 5,113 ton Reynolds.
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On 31st Oct 1942 he sank the British 7,041 ton Empire Guidon.
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On 3rd Nov 1942 he sank the Brazilian 5,187 ton Porto Alegre.
| 19.01.1943 - 24.03.1943
Fifth Sailing - active patrol
On the 19th Jan 1943, U-504 left Lorient under the command of Wilhelm Luis and arrived back at Lorient just over nine weeks later on 24th Mar 1943.
On 21st Jan 1943 in square BF 48, U-504 came under attack from an unidentified aircraft. U-504 was not damaged by the attack.
At 1925 HRS on 12th Mar 1943 in square DH 98, U-504 came under attack from an unidentified aircraft. U-504 was not damaged by the attack.
| 21.04.1943 - 29.05.1943
Sixth Sailing - active patrol
U-504 departed under Wilhelm Luis from Lorient on 21st Apr 1943 and after five and a half weeks arrived at Bordeaux on 29th May 1943.
| 27.07.1943 - 30.07.1943
Seventh Sailing - active patrol
U-504 left Bordeaux under the command of Wilhelm Luis on 27th Jul 1943. U-504 was lost on 30th Jul 1943.
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