My uncle fought near Dunkirk. He and two of his friends were late getting to the beach where their ship sailed from. They stood on the beach and saw their ship get torpedoed. There were no survivors, so they lost all their friends. They managed to find their way to a cottage and were taken in by the French family living there. After many weeks of hiding, they managed to get home on another ship. Nobody realised that there was anything wrong with my uncle until one morning when a policeman knocked on his wife's door. He had been found running round the streets, stark naked and singing, obviously in a state of confusion. He had shell shock. He was treated in hospital and went home to his wife, but never really recovered, having witnessed the demise of his friends and being under constant bombardment. He was only 68 when he died of a heart attack and I'm sure that he would have been much younger than that if it had not been for the French family that took him in.
The French insult the English all the time. A joke is just that, a joke, not to be taken seriously!