Together with her husband, Rol-Tanguy actively participated in the liberation of Paris. In May 1944, under the pseudonym Rol, Henri was appointed regional leader of the FFI, and for several weeks he worked to organize the Liberation of the French capital. She worked with Henri and his staff to set up a command post in an underground shelter in Place Denfert-Rochereau. From this covert command post, the Rol-Tanguy couple received and distributed information and orders for the Résistance.On 19 August 1944 she and Henri published a pamphlet calling citizens in Paris to arms and decreeing general mobilisation. This marked the beginning of the end of the Nazi occupation. Rol-Tanguy described their roles at this time, saying: "Henri was circulating a lot at that time, I was stuck down there to relay the communiqués.”Paris was finally liberated on August 25 by General Leclerc's 2nd Armoured Division. Rol-Tanguy recalls this overwhelming experience, saying that,"When they told us, we didn't hear the bells ringing, but we had a pillow fight with the girls who were with me."