Upon arrival in London, she joined the Free French forces. She began organising a body of french doctors and nurses, taking command as a captain. With part of her group, she joined the 1st Free French Division in Beirut, where she remained at the disposal of command. She helped fighting the Nazi invasion of Russia and found the pilots of the Normandie-Niemen. In April 1944, she returned to Algiers and followed the French corps in the Italian Campaign where, from General Jean de Lattre de Tassigny, she received authorisation to create a unit of "liaison-relief" intended to give first aid and bring essential aid to liberated populations and combat zones.