 In 1756 he married the 19-year-old Lady Elizabeth Spencer (January/March 1737-30 April 1831), a daughter of Charles Spencer, 3rd Duke of Marlborough by his wife Elizabeth Trevor.As his London townhouse he purchased 40 Queen Anne St, Marylebone which he used for entertaining during the "London season".This must have been before 1760, as early that year he was despatched with his regiment to Germany to take part in the Seven Years' War as a Major-General in command of the Cavalry Brigade in Germany until the following year.