Coquetdale sailed from Falmouth with a cargo of coal on 31st July 1940, as part of Convoy CE8, bound for Southend-on-Sea. In fact she broke away from that convoy and berthed at Portsmouth to unload, intending to return to Falmouth with Convoy CW9 (codenamed Peewit) as it sailed west a few days later. At 4.30am on 8 August, in company with five other merchant vessels (led by the Balhama), Coquetdale left St Helens Roads to the east of the Isle of Wight to rendezvous with Convoy CW9. From there Coquetdale was due to sail to the Clyde.
Others within CW9 included The Ajax, Borealis and Empire Crusader were all sank on the 8th August 1940 by German aircraft in a tale in which many lives were lost.
The wreck has collapsed over to port. Her hull plating amidships has blown outwards on her starboard side.