 When France capitulated to Adolf Hitler's Germany in June 1940, Słowikowski organized the clandestine evacuation of Polish military personnel, and later an intelligence service that reported to Polish military authorities in London.In July 1941 Słowikowski left for Algiers, where (using the codename ""Rygor"" — Polish for "Rigor") he set up "Agency Africa," one of World War II's most successful intelligence organizations.His Polish allies in these endeavors included Lt. Col. Gwido Langer and Major Maksymilian Ciężki.