420 Snowy Owl Squadron (Pugnamus Finitum), RAF Middleton St George. Wellington X aircraft MS 479 PT-F was shot down by German flak units 2 & 3/Schwere Flak Abteilung 430, 1/Schwere Flak Abteilung 134, 4/Schwere Flak Abteilung 394, 3/Schwere Flak Abteilung 642 and 3/Infantry Flak Regiment 42 during an operation against targets in Dusseldorf, Germany
The Wellington crashed at Essen-Borbeck with the loss of the entire crew
Pilot Officer William Alexander Walkinshaw (RCAF), Warrant Officer Class 2 Frederick Bemi (RCAF), Warrant Officer Class 2 David Finlay Evans (RCAF), Pilot Officer Kenneth Watson Barker MacDonald (RCAF) and Warrant Officer Class 2 Ronald George Rispin (RCAF) were all killed in action
Nachtjagd Combat Archive 1943 Part 1, 1 January - 22 June by Theo Boiten, page 56
Royal Air Force Serial and Image Database
Bomber Command Museum Monthly ORB