He was mobilized at the outbreak of the First World War and accompanied his regiment to Egypt, where he was promoted captain in 1915 and went onto the general staff [REF].
According to Scott Anderson in Lawrence in Arabia (Doubleday, 2013, at p. 254), Ormsby-Gore by 1916 had become a convert to Judaism and was one of the primary figures in the British government who favoured the creation of a Jewish homeland in Palestine.