Dennis was the son of Mark and Edith Davies of Cardiff, Wales. No further details can be found on his family to date.

Dennis was an air gunner on Halifax LW720 which departed from RAF Lissett at 23.00 on a night operation to Aachen to attack railway yards. Outward-bound, the aircraft was intercepted and shot down by night fighter pilot Major Hans Karlewski of the 2./NJG 1, who was flying a Heinkel He 219 A-0 from Venlo airfield in the Netherlands. The aircraft crashed on the outskirts of Dürboslar, Germany. Dennis was one of three aircrew who were killed with the other four aircrew becoming prisoners of war.

F/E, William Marley Rivers, 1293598, killed.
Pilot, John Meredith Roberts, 176514, killed.

Arthur Robert Brice, 1577795, POW Stalag Luft L7
W. C. Graham, J/22433, RCAF, POW Stalag 6G.
C. Weeks, 1319454, POW.
J. H. Wilson, 1567315, POW Stalag Luft L7.