Robert-Richard Zapp Ships attacked Ships attacked

| Date_ | Ship | Nationality | Tonnage | Fate |
|---|---|---|---|---|
| 17 April 1942 | Heinrich von Riedemann | Panama | 11020 | Sunk |
| 26 April 1942 | Alcoa Partner | USA | 5513 | Sunk |
| 29 April 1942 | Harry G. Siedel | Panama | 10354 | Sunk |
| 2 May 1942 | Sandar | Norway | 7624 | Sunk |
| 3 May 1942 | Geo. W. McNight | United Kingdom | 12502 | Damaged |