It took me to the age of the Internet in recent years to find this movie. I think it was an old movie when I saw it for the first time in the late 70's, maybe early eighties.
It's about a POW camp in WWII. The strictest of German prison camps holed in a mountain fortress 10 miles from the Swiss border. A few break out in a lifting way.
Enjoy, and if you can't watch now, please find the time soon
The Birdmen
http://youtu.be/PNafDPikh6E
The Officers Prison (OFLAG) https://en.wikipedia.org/wiki/Oflag_IV-C at Colditz Castle, is more than 400 miles away from the Swiss border.
Good story, though.