1891 Nov 11. born Letterkenny, Donegal.
1901 census at Ardrumman, Castlewray, Donegal)
1910 Apr 14. Leaves UK for Canada with brother James A.
1913 May 1. Arrives in New York from UK. A farmer from Letterkenny, travels with brother James Alexander
1914 Mar 31. Arrives in Canada from UK.
1914 Dec 19. Commissioned 2nd Lt. Edmund Francis Hayes Mansfield, 3rd Battalion, Royal Irish Fusiliers
1915 Jun 4. The undermentioned Second Lieutenants (on probation) are confirmed in their rank : 3rd Battalion, The Royal Irish Fusiliers. Edmund Francis Hayes Mansfield
1915 Apr 18 Lands in France
1920 Sep 7 Gazetted out. 3rd R Ir. Fus.—Lt. E. F. H. Mansfield, and is granted the rank of Capt.
1920 Dec 14. Joined ADRIC with service no 1252. Posted to F Coy
1921 Jan 19. "Services dispensed with"
1923 Feb 1. Leaves UK for Beira. He is a farmer intending to live in South Africa
1950 Died S Africa. Estate papers appear in National Archives of South Africa