I am at present reading WHERE THE HELL HAVE YOU BEEN? written by TOM CARVER who is the step-grandson of Field Marshal Montgomery. Tom's father Richard Carver was seving with his stepfather General Montgomery in 1942 at his HQ in North Africa when he was captured and transported to FONTANELLATO POW camp, north of PARMA. The book tells of Tom Carver's journey on foot, from the pow camp, south over the Appennines for 500 miles till he found and rejoined the Allied HQ in the winter of 1943.
It is well written and contains photos and maps so might be of interest to you if you have not come across it before.
Colin.