Submarines and blockades dominated the war at sea in 1915. The major event was the sinking by U-20 of the Lusitania, which edged America closer to war. The Germans had announced a blockade of Britain in February, using submarines to sink and harry shipping. A British blockade of Germany was announced in March in retaliation. Using its surface fleet to stop neutral vessels, the British attempt was more successful. The British submarine force was also successful, commanders leading patrols into the Black Sea and the Baltic Sea.
Phil Carradice takes us through the First World War at sea in photographs, showing us both the horror of war and day to day life.