Robert-Richard Zapp Ships attacked Ships attacked

| Date_ | Ship | Nationality | Tonnage | Fate |
|---|---|---|---|---|
| 29 June 1941 | George J. Goulandris | Greece | 4345 | Sunk |
| 29 June 1941 | Kalypso Vergotti | Greece | 5686 | Sunk |
| 30 June 1941 | Saint Aslem | United Kingdom | 5614 | Sunk |
| 19 July 1941 | Holmside | United Kingdom | 3433 | Sunk |
| 26 July 1941 | I. C. White | Panama | 7052 | Sunk |
| 18 January 1942 | Allan Jackson | USA | 6635 | Sunk |
| 19 January 1942 | Lady Hawkins | Canada | 7988 | Sunk |
| 22 January 1942 | Olympic | Panama | 5335 | Sunk |
| 24 January 1942 | Empire Gem | United Kingdom | 8139 | Sunk |
| 24 January 1942 | Venore | USA | 8017 | Sunk |
| 14 April 1942 | Korthion | Greece | 2116 | Sunk |
| 16 April 1942 | Amsterdam | Netherlands | 7329 | Sunk |