The Battle of Gangut took place on 27 JulyJul./ 7 August 1714Greg. during the Great Northern War (1700–1721), in the waters of Riilahti Bay, north of the Hanko Peninsula, near the site of the modern-day city of Hanko (Hangö), Finland, between the Swedish Navy and Imperial Russian Navy. It was the first important victory of the Russian fleet in its history. It is commemorated in Russia as one of the Days of Military Honour.