Typically, following capture, these would have been the dates of transfers as per my Father. Sgt Barker would have been about 10 days behind in the early camps. Have you seen Sgt. Barker's POW liberation questionaire which would explain this?
Dulag Luft – 6th July 1941
Stalag IXc, Bad Sulza - 10th (ICRC 14th) July 1941 to 29th April 1942.
Stalag Luft III, Sagan in the East Compound – 1st May (ICRC 30th April) 1942 to 18th June 1943.
Stalag Luft VI, Heydekrug, Barrack C5 – 20th ( ICRC 14th) June 1943 to 18th July 1944. Stalag Luft VI closed at this time with the advancing Russians on their way.
Stalag 357, Thorn, Poland – 19th (ICRC 18th) July 1944 to 8th August 1944. (Later this camp became known as Stalag XXA).
Stalag 357, Fallingbostal (Part of Stalag XI-B) – August 1944 to 7th April 1945.
8th May, The last of the POW’s evacuated from Fallingbostal are liberated on this day.
I know l have other details on Sgt. Barker at home so will see what l can find.
Regards,
Nick