Little after the allied Disembarking in North Africa in 1942, Pierre's regiment sided this time with the Allies and engaged in the Tunisia Campaign against the Afrika Korps of Rommel. At Loukanda, he led his combat company facing a superiorly numbered and better-equipped enemy. In July 1943, Pierre participated to the creation and reforming of the Marching Regiment of the Foreign Legion (R.M.L.E) with whom, he disembarked at Provence, delivered the Franche-Comté and progressed till Danube. Pierre would be made knight of the order of the Legion of Honor.