HMS Marshal Ney was the lead ship of her class of two monitors built for the Royal Navy during the First World War. Laid down as M13, she was renamed after the French field marshal of the Napoleonic Wars Michel Ney. After service in the First World War, she became a depot ship and then an accommodation ship. Between 1922 and 1947, she was renamed three times, becoming successively Vivid, Drake and Alaunia II. She was scrapped in 1957.
Designed for inshore operations along the sandbank-strewn Belgian coastline, Marshal Ney was equipped with two massive 15inches naval guns in a single turret. Originally, these guns were to have been stripped from one of the battlecruisers and after they were redesigned. However, the guns were not ready, and guns intended for the battleship were used instead.
The diesel engines used by the Marshal Ney-class ships were a constant source of technical difficulty, hampering their use. Marshal Ney in particular was—in the words of Jane's Fighting Ships—"practically a failure", on account of her MAN diesel engines being so unreliable. A contemporary description of the engines by Admiral Reginald Bacon, commander of the Dover Patrol from April 1915, shows how fault-prone they were:
"Reliability both in officer and a ship is the first thing that an Admiral values. The Marshal Ney, judged by this standard, was a hopeless sinner; but her officers and men made up for her deficiencies. Her engines not infrequently exploded when asked to start; her engine-room was scarred as if by shrapnel from the fragments of burst cylinder heads, and the escapes of the engine-room staff were miraculous. Her Chief Engineer, Mr. Swan, stuck to the engines like a Trojan and almost overcame their bad habits; and really, when talking to him, you were almost converted to the opinion that just one little alteration would make them start next time the ship was required. Added to this, when they did not burst, they usually would not start, and when once started no one liked to stop them for fear of not being able to start them again. But, without exaggeration, the more they burst and the worse they behaved, the more Mr. Swan loved them and the more cheery Captain [Hugh J.] Tweedie became."
Assigned to the Dover Patrol, Marshal Ney served with her sister ship .
Following her poor sea trials and continued poor operational performance off the Belgian coast, it was decided to remove her 15 inch guns and place them in the hull of a new monitor. Her 15 inch turret was removed at Elswick in January 1916, where it was re-engineered to fire up to an increased angle of 30 degrees. The turret was then shipped to Belfast and fitted to . Terror would soon launch, and join the Dover Patrol together with her sister, .
Marshal Ney was then rearmed with a single gun and four guns, all of which had been taken from . However, another refit in 1916 to 1917 saw the 9.2 inch gun removed for use ashore in France. In the large gun's place her 6 inch armament was increased to six BL 6-inch Mk XI naval guns, which had been removed from .
After her refit, Ney was relegated for service as a moored guardship at The Downs. She engaged German destroyers during a raid on Ramsgate on 27 April 1917, causing the German force to withdraw.
During 1919, Marshal Ney was used as a base ship at Queenborough, before being disarmed and becoming a depot ship at Fort Blockhouse from 1920. Renamed Vivid in July 1922, she then served as an accommodation ship for the stoker training section at Devonport, where she remained until 1957. She was again renamed Drake in January 1934, and Alaunia II in 1947.
She arrived at Thos. W. Ward's shipyard at Milford Haven on 6 October 1957 for breaking up.