Andre Heintz was a member of the French Resistance:
In early May 1944, my leader’s wife came to the school where I was teaching. She made me learn six sentences by heart, and also gave me their meanings. The messages would be broadcast just before the invasion, giving us a sign to start our acts of sabotage.
It seemed an awfully long time between the beginning of May and 1 June, when the first message was finally broadcast, signalling that the invasion would happen within the next week. That Sunday, 4 June, I went to a party at a friend’s house. As I stood there with people dancing all around me, I had this strange feeling that I was like a little god, because I could see into the future. I wanted to warn all my friends to go into hiding, but of course I couldn’t say anything, not even to my parents, because I was sworn to secrecy. I stood there wondering how many of my friends would survive.
The next day, Monday 5 June, we knew that something would happen soon, because the train from Paris didn’t reach Caen – the lines had been sabotaged. That evening I heard two messages – ‘the dice are on the table’, meaning we should sabotage railway lines; and ‘it’s hot in Suez’, meaning we should attack telephone lines.
Read the whole of his story on BBC People’s War