Alberta's Child...great story. Must be so many more out there too.
They hardly lived as prisoners, though. The prairies were so stark and unforgiving in the winter that nobody bothered keeping a close watch on them. They were simply left in small settlements to fend for themselves, and they interacted regularly with the Canadian who farmed in the area and lived in the small prairie towns. Many of them learned to play ice hockey for the first time.
When the war was over, the prisoners were sent back to Germany as any POWs would be. However, most of them were so fond of Canada that they immediately began applying to emigrate to Canada, to go back and live in the same places where they had been "held" as prisoners of war.