Russo-Swedish War: During the Battle of Svensksund in the Baltic Sea, the Swedish Navy captured a third of the Russian fleet.

The Russo-Swedish War of 1788–1790 was fought between Sweden and Russia from June 1788 to August 1790. The war was ended by the Treaty of Värälä on 14 August 1790 and took place concomitantly with both the Austro-Turkish War (1788–1791), Russo-Turkish War (1787–1792) and Theatre War. The war was, overall, mostly insignificant for the parties involved.

The Second Battle of Svensksund 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 (1788–1790). The battle is the biggest Swedish naval victory and the largest naval battle ever in the Baltic Sea. It qualifies among the largest naval battles in history in terms of the number of vessels involved.

The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North and Central European Plain regions. It is the world's largest brackish water basin.

The Swedish Navy is the maritime service branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet, formally sometimes referred to as the Royal Navy – as well as marine units, the Amphibious Corps.

The Russian Navy is the naval arm of the Russian Armed Forces. It has existed in various forms since 1696. Its present iteration was formed in January 1992 when it succeeded the Navy of the Commonwealth of Independent States.