After 15 years, Carton de Wiart's peaceful Polish life was interrupted by the looming war, when he was recalled in July 1939 and appointed to his old job, as head of the British Military Mission to Poland. Poland was attacked by Nazi Germany on 1 September and on 17 September the Soviets allied with Germany attacked Poland from the east. Soon Soviet forces overran Prostyń and Carton de Wiart lost all his guns, fishing rods, clothing, and furniture. They were packed up by the Soviets and stored in the Minsk Museum, but destroyed by the Germans in later fighting. He never saw the area again, but as he said "they did not manage to take my memories".