After asking his cousin for contacts within the French Resistance, Bloch joined the Maquis in Bourganeuf on 19 February 1944 and took the pseudonym "Jacques Binet". During the liberation of Guéret on 7 June 1944, he was wounded in battle against the 2nd SS Panzer Division Das Reich and taken to a hospital, where a surgeon amputated his arm. Upon his release, he was discovered by a soldier of the Milice and handed over to the Gestapo. Escaping immediate execution, he was sent to Montluçon.
