The Battle of May Island is the name given to the series of accidents that occurred during Operation E.C.1 in 1918.Named after the Isle of May, a nearby island in the Firth of Forth, it was a disastrous series of accidents amongst Royal Navy ships on their way from Rosyth in Scotland to fleet exercises in the North Sea. On the misty night of 31 January to 1 February 1918, five collisions occurred between eight vessels. Two submarines were lost and three other submarines and a light cruiser were damaged. 105 men died, all of them Royal Navy.