This took place on 13 October 1644 north-west of the island of Femern, now part of Germany, in the Baltic Sea. A combined Swedish-Dutch fleet defeated a Danish fleet and took 1000 prisoners, including Ulfeld, Grabov and von Jasmund. October 13 is the 286th day of the year (287th in leap years). ... Events February to August - Explorer Abel Tasmans second expedition for the Dutch East India Company maps the north coast of Australia. ... The Baltic Sea is located in Northern Europe, bounded by the Scandinavian Peninsula, the mainland of east and central Europe, and the Danish islands. ...

The Swedes had 16 ships with 392 guns, and the Dutch had 21 ships with 483 guns (making a total of 37 ships with 875 guns). The Danes had 17 ships with 448 guns. The Swedes expended two fireships and the Dutch lost one ship. The Danes lost 10 ships captured, including their largest three, and two wrecked.

Ships involved:

Sweden

Drake 40
Smålands Lejon 32 (flag)
Göteborg 36
Leopard 36
Regina 34
Tre Kroner 32
Jägare 26
Vesterviks Fortuna 24
Akilles 22
Svan 22
Gamla Fortuna 18
Lam 12 (galley)
Fenix 10 (galley)
Postpferd 2 (galley/galliot)
Lilla Delfin (fireship) - Burnt
Meerman (fireship) - Burnt
? (merchantman)

Netherlands

Delphin 38
Jupiter 34
Engel 34
Gekroende Liefde 31
Coninchva Sweden 28
Campen 26
Den Swarten Raven 26
Vlissingen 24
Nieuw Vlissingen 24
St Matthuis 24
Patientia 24
Arent/Adelaar 22 - Sunk by Tre Løver
Nieuw Gottenburg 22
Liefde van Hoorn 20
Prins 20
Wapen van Medenblik 20
Posthorn 20
Brouwer 20
St Marten 20
Harderinne 8
? 2 (galliot)

Denmark

Patienta 48 (flag) - Captured
Tre Løver 46 - Captured
Oldenborg 42 - Captured
Lindorm 38
Pelican 36
Stormar 32 - Captured
Delmenhorst 28 - Captured
Fides 28 - Captured
Neptunus 28 - Captured
Nelleblad 24 - Captured
To Løver 22 - Captured
Kronet Fisk 20 - Aground and captured
Lam 16
Markat 16
Havhest 14
Højenhald 8 - Wrecked
? 2 (galley/galliot) - Wrecked