Seventy years ago: The dust has settled, the armistice is signed, the nation lies prostrate. Usually you go for a stroll down the Rue de Rivoli around this time of day, to clear your head, browse the shopwindows, sit for awhile in the Tuileries. But today this is the sight that greets you: not a relaxing one. And for four more years this is Paris, second city of the Third Reich.