Major battles included those at Heligoland Bight (in 1914 and again in 1917), Dogger Bank (in 1915), and Jutland (1916). Though British tactical success remains a subject of historical debate, Britain accomplished its strategic objective of maintaining the blockade and keeping the main body of the High Seas Fleet in port for the vast majority of the war. The High Seas Fleet remained a threat as a fleet in being that forced Britain to retain a majority of its capital ships in the North Sea.