 In 1958, Mabire was sent as a reserved soldier to North Africa during the Algerian War (1954-62).Between 1963 and 1965, he wrote articles in Philippe Héduy's "L'Esprit public", and was a contributor in "Cahiers universitaires", the magazine of the Federation of Nationalist Students (FEN).In 1965, he was part of the grassroots committees of far-right presidential candidate Jean-Louis Tixier-Vignancour, and wrote in January a book to explain his endorsement.