| Shipwrecks |
- 6 Apr: U-1, U-50
- 8 Apr: HMS Glowworm, Rio de Janeiro
- 9 Apr: HNoMS Æger, Blücher, HNoMS Eidsvold, HMS Gurkha, German cruiser Karlsruhe, HNoMS Norge, Seattle, Sørland, HNoMS Tor
- 10 Apr: Albatros, Z22 Anton Schmitt, Friedenau, HMS Hardy, HMS Hunter, Königsberg, HMS Tarpon, HMS Thistle, Z21 Wilhelm Heidkamp
- 11 Apr: V 105 Cremon
- 13 Apr: Z11 Bernd von Arnim, Z17 Diether von Roeder, Z12 Erich Giese, Z13 Erich Koellner, HNoMS Frøya, Z2 Georg Thiele, Z18 Hans Lüdemann, Z19 Hermann Künne, HNoMS Storm, U-64, Z9 Wolfgang Zenker
- 14 Apr: Bärenfels, Brummer, Oldenburg
- 15 Apr: U-49
- 18 Apr: HNoMS Sæl, HMS Sterlet
- 20 Apr: Stegg
- 25 Apr: HMS Bradman, Trygg
- 26 Apr: HNoMS Garm
- 29 Apr: HMS Unity
- 30 Apr: HMS Bittern, HMS Dunoon, Maillé Brézé
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