FRENCH FREE SECRET AGENTS 1940-1944 PASCAL LE PAUTREMAT

How did so few men manage to organize resistance networks and gather so much intelligence in such a short time despite being unceasingly hunted by the German and Vichy counterespionage services?It is thought that 70% of the information which was vital for the Allies before the Normandy landings in 1944 was sent by French agents working for the BCRA