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As a former Royal Horse Artillery and Royal Navy Volunteer Reserve officer he was inspired to turn his talents and his technical staff to producing boats after reading an article by Vice-Admiral Cecil Vivian Usborne.
In 1905 he received the substantive promotion to lieutenant-colonel and served with the Royal Horse Artillery under Sir Douglas Haig.
He remained an Honorary Major in the Royal Horse Artillery (TA) and an Honorary Colonel in the 4th (Cadet) Battalion of the Essex Regiment and in the 6th Battalion of the Essex Regiment (TA).
The gun was used by Royal Horse Artillery batteries of Territorial Force cavalry units (Yeomanry) early in World War I, most notably in the campaign in Egypt against the Senussi by A Battery, Honourable Artillery Company and the Nottinghamshire RHA.
In 1925, after graduating from Woolwich, Williams-Wynn was commissioned into the Royal Regiment of Artillery; He served in the Royal Horse Artillery, was an Instructor at the Equitation School, Weedon, Adjutant of the 61st (Carnarvon and Denbigh Yeomanry) Medium Regiment of the Royal Artillery (Territorial Army), from 1936 to 1940, and was promoted Major in 1940, having been appointed a Justice of the Peace in 1937.
Due to its quick beat, the tune of "The Keel Row" is used as the trot march of the Life Guards of the Household Cavalry as well as of the Royal Horse Artillery.
The division crossed to France between 15 and 18 August 1914, concentrated around Maubeuge between 18 and 20 August, and moved forward towards Mons on 21 August.
During the 1950s, all British men were obliged to fulfil a period of national service and in the latter part of 1956, Duff received call-up papers to the army's Royal Horse Artillery, based in Surrey.
Highlights included the Royal Horse Artillery parading and firing their guns as well as the M.A.D mountain bike display team.