1897 Jul 28 Born Londonderry
1901 census at 21 in Bishop Street, Londonderry
1911 census at 26 Great James' Street, Londonderry
Attended Foyle College
1915 Feb 11, Enlisted with Black Watch in Londonderry. He was a student living at 44 Great James St, Londonderry
1917 May 30. Commission 2nd Lt in R Irish Fusiliers
1917 Aug 11. On a list of British Casualties. Wounded D B C McMonagle
1918 Sep 3. Attached to RAF
1918 Nov 30. Temp. 2nd Lit. D. B. C. McMonagle to be temp. Lt.
1919 Sep 4. Demobilised
1919 - 1920 Dental Student at QUB
1920 Nov 19. Joined ADRIC with service no 1075. Posted K Coy
1920 Dec 11. In K Company when the burning of Cork and the grenade attack on K Coy tender took place at Dillons Cross. He was wounded and sought compensation and received £585 for his wounds
1920 Dec 11. Admitted Military Hospital Cork
1921 Mar 26 Posted to Depot Coy
1921 Apr 6. Into Stevens Hospital
1921 May 27 to 27 Jul Medical Leave
1921 Aug 27. Posted to O Coy
1922 Jan 16. Discharged on demobilisation of ADRIC
1922-1923 With Ulster Special Constabulary
1924 Feb 6. Married at St. Thomas Church of Ireland, Belfast, to Victoria May Walker (1901–1989)
1937 Sep 28. The Civil Service Commissioners for Northern Ireland hereby announce that Certificates of Qualification for the situation of Male Clerical Assistant have been issued in favour of the under-mentioned persons:——David Babington Cunningham McMonagle.
1968 Sep 19 died at Northern Ireland Radiotherapy Centre, Lisburn, County Down