The Russian battlefleet under Samuel Greig met the Swedish fleet off Hogland Island in the Gulf of Finland on July 17, 1788, at the Battle of Hogland. The battle was tactically indecisive, but the Russians did enough to prevent the Swedish landing. As the war was deeply unpopular in Sweden and the Finnish officers were mutinous, news of the failure at Hogland triggered a revolt among some of the noble army officers, known as the League of Anjala.