The Swedish Navy captures one third of the Russian Baltic fleet.

The Second Battle of Svensksund (Finnish: Ruotsinsalmi, Russian: Rochensalm) was a naval battle fought in the Gulf of Finland outside the present day city of Kotka on 9 and 10 July 1790. The Swedish naval forces dealt the Russian fleet a devastating defeat that brought an end to the Russo-Swedish War (17881790). The battle is the biggest Swedish naval victory and the largest naval battle ever in the Baltic Sea.

The Swedish Navy (Swedish: Svenska marinen) is the naval branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet (Flottan) – as well as marine units, the Amphibious Corps (Amfibiekåren).

In Swedish, vessels of the Swedish Navy are given the prefix "HMS", short for Hans/Hennes majestäts skepp (His/Her Majesty's Ship). In English, this is sometimes changed to "HSwMS" ("His Swedish Majesty's Ship") to differentiate Swedish vessels from those of the British Royal Navy.