1895 Jul/Sep Born Lisnaskea, Fermanagh
1901 census at Stranfeely, Deerpark, Fermanagh
1911 census at Deerpark, Fermanagh
1914 Aug 7. Landed in France.
1918 Oct 30. R Irish Fus. The undermentioned, from Officer Cadet Units, to be 2nd Lts.: — Henry James Armstrong
1920 Apr 1. The undermentioned relinquish their commns.3rd R. Ir. Fus.—2nd Lt. H. J. Armstrong, and retains the rank of 2nd Lt.
1920 Sep 1. Joined ADRIC with service no 514. E Coy
He was fined £2 by Coy Commander (undated)
1921 Aug 12. Re-engaged
1922 Jan 19 Discharged at demobilisation of ADRIC