From Craftzine:
First, the story of Major Alexis Casdagli, who was imprisoned by the Nazis from 1941 to 1945. To pass the time, he began stitching on scraps of canvas and bits of thread. The most outstanding piece is a seemingly innocent sampler with a border design – but the dots and dashes are actually Morse code that spell out “God Save the King” and “Fuck Hitler”.
Source: cynical-c.com