( source: http://www.sharkhunters.com/historya.htm )Lüth was awarded the Diamonds, and here is the text of the radiogram of 24 October 1943
“Order of the day. Men of the U-boat arm: the Führer today presented to Kapitänleutnant Wolfgang Lüth the Oak Leaf Cluster with Swords and Diamonds to the Knights Cross of the Iron Cross which had been awarded to him previously. This was after his return from his 15th trip against the enemy. Thereby one of the senior warriors from your ranks received the highest German order for bravery as the first officer of the Navy to do so. Uninterrupted in the U-boat attack, from the first day of the war on, he proved himself most excellent in all phases of the U-boat war, in the hard battle close to the English coast, in the embittered struggle of the convoy battles and in the hunt in the expanses of the Atlantic and Indian Oceans. His unyielding tenacity and his lightning-fast, determined attack embody the typical deportment and efficiency of the German U-boat man.”
...some questions:
Was it standard procedure that successful U-Boat commanders showed all their "victory flags" when returning to base ?
In the stills below ( taken from: Der U-Boot Krieg, part III), U-181 is flying over 40 victory flags after her 202 days patrol, Lüth sank 45,331 BRT during this Feindfahrt, but for sure not over 40 ships...(?)