Original sentence: The small submarine commanded by Oberleutnant zur See Lüth contributed to the submarine successes announced in the Wehrmachtbericht on 21st September with the sinking of four enemy merchant ships of 29 000 GRT
Edited sentence: The small submarine commanded by Oberleutnant zur See Lüth contributed to the submarine successes announced in the Wehrmachtbericht on 21 September with the sinking of four enemy merchant ships of 29 000 GRT