The barbettes of Furious were designed to accommodate either turret, in case problems arose with the 18-inch gun's development.

[4] The guns proved to be too powerful for Furious' light hull, and they became available for other uses during 1917, after trials showed the ship could not handle the stress of firing.

Admiral Sir Reginald Bacon, commander of the Dover Patrol, conceived a plan to mount two guns inside the shell of the Palace Hotel in Westende from where they could bombard the naval facilities at Zeebrugge and Bruges, provided that the hotel was captured during the upcoming Battle of Passchendaele.

He also thought that they could be used on the decks of monitors and as such a dual purpose carriage was designed for the guns, which could be used both afloat and ashore.

As much as possible of the gun and its mount was designed to be assembled out of range of German artillery and then moved on a special broad-gauge railway to the site on specially-designed wheels.

The mount could only traverse 10° inside its fixed, ½-inch (12.7 mm) gun shield and was aimed over the starboard side of the monitor.

The cordite propellant charges were kept in eighteen steam-heated storage tanks mounted on the forecastle deck abaft the funnel and moved to the gun on a bogie mounted on rails, two one-sixth charges at a time, which reduced the rate of fire to about one round about every 3–4 minutes.

The forward gun was removed from Furious in March 1917, before she was completed, when she was ordered to be converted to a seaplane carrier.

The gun from Furious' 'A' turret was lifted aboard on 9 July, but the General Wolfe was not ready to begin firing trials until 7 August.

[9] General Wolfe was assigned to the Dover Patrol on 15 August 1918, but did not fire on any targets until 28 September, when a large force of monitors was gathered to harass German lines of communication.

[4] Wear on General Wolfe's gun was measured at about 0.37 in (9.4 mm) after firing 161 effective full charges (EFC) - 105 rounds including proof and practice, with 57 being supercharges.

[13] The third gun, from Furious' 'Y' turret, was intended for Prince Eugene, which had been modified to accept it earlier in the year, but the war ended before it was mounted, although the monitor was ordered to Portsmouth to have it fitted on 19 October.

1, from Furious' 'Y' turret, was lined down to 16 inches (410 mm) and used in cordite-proving tests for the BL 16-inch Mk I gun, intended for the cancelled G3 battlecruisers, and used in the Nelson-class battleships.