During the Great Northern War, the Baltic Fleet assisted in taking Viborg, Tallinn, (Estonia), Riga, (Latvia), the West Estonian archipelago (Moonsund archipelago), Helsinki, (Finland), and Turku. The first claimed victories of the new Imperial Russian Navy were the Gangut (Swedish: Hangöudd) in 1714 and, arguably, the Grengam (Swedish: Ledsund) in 1720. From 1715, the English Royal Navy intervened in the Baltic Sea on behalf of the German principality of Hanover, (dynastic home of the current British monarchy) and more or less in a tacit alliance with Russia.