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[[Image:RebeccaWalker.png|thumb|left|100px|Rebecca Walker]]On [[August 25]], [[1769]], Durnford married Rebecca Walker in London. The next year, Durnford was promoted to Engineer-Extraordinary with the rank of Captain-Lieutenant; he was again promoted, to Engineer in Ordinary with the rank of Captain, on [[March 26]], [[1779]]. Durnford was the commanding British officer during the defense of [[Mobile]] in [[1780]] against [[Bernardo de Gálvez y Madrid, Count of Gálvez|Gálvez]]'s besieging Spanish force; Durnford's recommendation to superiors that £2,500 be spent to improve the city's defenses was ignored, and Durnford was forced to surrender the city of Mobile on [[March 13]], [[1780]]. Spain later retook Pensacola on [[May 9]], [[1781]]. After his defeat at Mobile, Durnford returned to England and assumed the office of Commanding Engineer at Newcastle, and later Chief Engineer at Plymouth. In [[1794]], Durnford, by then a colonel, was appointed to command the company of Royal Engineers accompanying Sir Charles Grey's expedition to attack French colonies in the [[Wikipedia:Caribbean|West Indies]]. Durnford died of yellow fever on the island of Tobago on [[June 21]], [[1794]].<ref>[http://members.cox.net/durnford/famous.html Famous Durnfords]</ref>