The Great Escape(1963)

Put a fence in front of these men... and they'll climb it!

The Nazis, exasperated at the number of escapes from their prison camps by a relatively small number of Allied prisoners, relocate them to a high-security 'escape-proof' camp to sit out the remainder of the war. Undaunted, the prisoners plan one of the most ambitious escape attempts of World War II. Based on a true story.