During the war, his elder brother, Charles was killed in action and Sackville assumed the former's courtesy title of Lord Worsley.
After the war, he was awarded the Military Cross and retired from the Army in 1919 when he married Nancye Brocklehurst (a niece of Lord Ranksborough).
[1] In 1926, Lord Worsley became a major in the Sherwood Rangers Yeomanry and on the death of his mother that year, inherited the baronies of Conyers and Fauconberg and the Portuguese countship of Mértola.
From 1936 to 1940 the earl commanded the Sherwood Rangers Yeomanry as a Lieutenant Colonel and fought in World War II from 1939 to 1944.
Together with his wife, he was a survivor of the aerial bomber bombardment of the RMS Empress of Britain in October 1940 (and later sinking under tow) in which 45 were killed off Ireland.