Said by RD Jeune to have been part of the intelligence set up in Dublin when Jeune was there. After leaving Ireland Jeune (after Bloody Sunday) says that Jeffries together with a staff officer Cameron, set up a "proper" secret service in Ireland, which was sucessfully accomplished. This seems to have happened in Dec 1920
Major later Brig William Francis Jeffries 1891 - 1969. Intelligence Dublin and Horse Guards 1920 to 1921
1891 Born only son of William Carey Jeffries, MD, Coolcarron, Co. Cork, and Maud Grace Kennedy, Ballinamultina, Co. Waterford;
Educated at Downside and Trinity College, Cambridge
1912 - 1913 Travelled in East. Wrote about his experiences "Two Undergraduates in the East, 1914"
1914 Aug. 2nd Lieut Royal Dublin Fusiliers (SR); served European War, 1914–18, France (wounded battles of Ypres, 1915 and Somme, 1916, despatches twice, DSO); Major, 1917;
1916 Dec 16. Graded as Staff Lieutenant.
1918 27 Jul in Times for DSO
1919-1920 Secretary, HM Legation to Vatican, Rome
1919 Nov 24. Maj. W. F. Jeffries, D.S.O., from R.D. Fus., to be Maj. 13th June 1923, with seniority 24th Nov. 1919.
1920 Married Leila Downing, d of Francis Downing, Ballyvelly, Tralee, Co. Kerry; one s ; died 12 July 1969
1920 Dec 15 The undermentioned relinquish their temp, appts. Capt. W. F. Jeffries, D.S.O., 3rd R,Dub Fus,Spec. Res
1920 Dec 15 Relinquish commission. 3rd R.D. Fus; Capt. W. F. Jeffries, D.S.O., 15th Dec. 1920, and is granted the rank of Maj.
1920-1921 Intelligence Staff, Dublin and Horse Guards
1922 Major Reserve of Officers
1923 - 1927 Administrative Officer, Southern Nigeria
1938 Maj., Gen. Staff
1940 Col, Gen. Staff, Special Employment,
1943 Brig. CMF, 1943.
1945 Officer, American Legion of Merit
1938 - 58 Secretary of Junior Carlton Club
Lived at Broomfield House, Sunningdale, Berks
British intelligence in Dublin Castle