These victories took place over a period of two war patrols.

U-42 had a very short career, being sunk while still on her first war patrol.

She completed her 12th and last war patrol on 14 August 1945.

U-200s first and only operational war patrol began on 12 June 1943.

She was used in training and made no war patrols during her first two years of service.

Six days later, S-28 departed on her fourth war patrol.

Ten days later, she got underway for the first of her 10 war patrols.

All eight of her war patrols were designated as "successful".

She began her ninth war patrol on 5 January 1944.

The most common would be the completion of two war patrols.