The One That Got Away by James Leasor (
Smashwords) - the true story of Franz von Werra, the only German prisoner of war to escape and return to Germany after being captured by the Allies. I read this years ago in paper. His son is working on releasing all his books as e-books.
I'm not sure if this will fit your criteria, but The Losing Role by Steve Anderson (
Smashwords) is a fictional story about a German participant in Operation Grief, where Germans dressed in US uniforms during the Battle of the Bulge.
Not really an escape story, but likely to be of interest: The One That Got Away by Chris Ryan is the true story of an SAS trooper who evaded capture during the 1991 Gulf War (the rest of his patrol were captured).