List of Knight's Cross of the Iron Cross recipients of the U-boat service

Columns: Number | Name | Rank | Unit | Date of award
5 | Günther Prien | Kapitänleutnant | commander of U-47 | 20 October 1940 | 6 | Otto Kretschmer | Kapitänleutnant | commander of U-99 | 4 November 1940 | 7 | Joachim Schepke | Kapitänleutnant | commander of U-100 | 1 December 1940 | 13 | Heinrich Liebe | Kapitänleutnant | commander of U-38 | 10 June 1941 | 14 | Engelbert Endrass | Oberleutnant zur See | commander of U-46 | 10 June 1941 | 15 | Herbert Schultze | Kapitänleutnant | commander of U-48 | 12 June 1941 | 23 | Viktor Hermann Otto Schütze | Korvettenkapitän | commander of U-103 | 14 July 1941

Example questions:
How many U-boats were commanded by the youngest Knight 's Cross of the Iron Cross person to receive an award on 15 July 1942 ? | Where was the U-boat commanded by the youngest Knight 's Cross of the Iron Cross oberleutnant zur See sunk ? | On which U-boat was the last person to receive an Iron Cross the Watch Officer ? | When was the U-boat commanded by the oldest Knight 's Cross of the Iron Cross korvettenkapitän launched ?

Answers:
5 | Bay of Biscay | U-29 | 22 October