Passage: During the Great Northern War of 1700-1721, the Russians built the Baltic Fleet. The construction of the oared fleet (galley fleet) took place in 1702-1704 at several shipyards (estuaries of the rivers Syas, Luga and Olonka). In order to defend the conquered coastline and attack enemy's maritime communications in the Baltic Sea, the Russians created a sailing fleet from ships built in Russia and others imported from abroad.

Question: What body of water were they ordered to attack in?
Baltic Sea