RN:
Late May 1915, Gibraltar. Battlecruiser HMS Inflexible undergoes repairs after she struck a Turkish mine in the Gulf of Erenköy on March 18 with 39 lives lost.
HMS Fearless in dry dock at Rosyth after a night exercise went horribly wrong and a number of collisions occurred. Fearless collided and sank the Sub K17.
On 31 January 1918 an incident that sardonically came to be known as the
Battle of May Island occurred. A number of Royal Navy warships, including
Fearless and her flotilla, were en route to Rosyth to take part in exercises, when due to a combination of mechanical failures and confusion over ship positions in the misty evening, a number of ships collided.
Fearless accidentally rammed and sank the submarine
HMS K17. She ground to halt, causing the other submarines in the flotilla to turn to avoid her, at which point a number of them were themselves struck by other following ships. In just over an hour, two submarines had been sunk, four others were damaged and
Fearless had also sustained considerable damage. Over 100 sailors were killed in the incident.
Fearless was repaired and survived the war, but was considered obsolete and was sold for scrapping on 8 November 1921, eventually being broken up in Germany.