[2] The first British steam 101-gun two-decker was the St Jean d'Acre, which was ordered and laid down in 1851 and was "the first ship that can be directly attributed to Sir Baldwin Walker's influence.

[5] While the post-war ships, from their greater length and finer lines, reached higher speeds they did so at the expense of the facility and precision of their response to the helm.

"[6][7] Duncan and Gibraltar "presented a very different appearance from the Baroque splendour of the early Eighteenth Century, with their regular outline bereft of almost all embellishment beyond the elliptical stern gallery and the figurehead and painted in the severe black and white bands of the era.

[11] 6 January 1864: Commanded by Captain Robert Gibson, flagship of Vice-Admiral James Hope, North America and West Indies.

[13] 15 June 1867 – 10 September 1867: Commanded by Captain George Hancock, Coast Guard, Leith (Queensferry) (replacing Trafalgar).

[14] 10 September 1867 – 28 February 1870: Commanded (until paying off) by Captain Charles Fellowes, Coast Guard, Leith (and flagship of Commodore of John Walker Tarleton's Coast Guard squadron comprising Duncan, Donegal, Revenge, Irresistible, Lion, Dauntless and Argus).

[17] 1 January 1875: Commanded by Captain Charles Thomas Curme, flagship of Vice-Admiral George Fowler Hastings, Sheerness.

[19] 8 September 1863 – December 1864: Commanded (from commissioning at Plymouth) by Captain James Charles Prevost, Mediterranean Fleet.