Early in the Second World War, Giraud fought in the Netherlands. In May 1940, he was again captured by the Germans, but made another successful escape from captivity in April 1942 after two years of careful planning. From within Vichy France he worked with the Allies in secret, and assumed command of French troops in North Africa after Operation Torch (November 1942) following the assassination of François Darlan. In January 1943, he took part in the Casablanca Conference along with Charles de Gaulle, Winston Churchill and Franklin D. Roosevelt. Later in the same year, Giraud and de Gaulle became co-presidents of the French Committee of National Liberation, but he lost support and retired in frustration in April 1944.