hello, here is a little and real story of a frenchman called Leon. In 1939, Leon said to his wife : I'm affraid. I think we will be in war soon. If one day I 'd be prisoner, I write to you with a black pen ink to explain you all is OK for me, if I write you in red ink, you'll be sure I have problems. In July 1940, Leon was prisoner and his wife had no news. Later she received a letter : Dear Louise, don't worry, all is OK for me. I write you with a black pen, here I have not found red ink to write to you.... this the little story of a soldier , his letter was read by the german army and he wrote what it was authorized, but this soldier knew that best, denis