Montesquiou was definitely converted to the royalist cause in August 1901. He was one of the few members of the old aristocracy to play a leading role in the Action Française movement. He became an increasingly important member of the movement. In September 1902 he was put in charge of the
notes de quinzaine in the
Action française review. By the end of December 1902 was chairman of the board of
Action française review, which had just been incorporated as a public limited company. He then organized a successful conference in Marseille followed by a series of conferences in the provinces from 1903 onward. He became one of the best and most active speakers of the movement. In January 1905 he became Secretary General of the new Ligue d'Action française. Montesquiou was among the many early members of the Action Française who were practicing Catholics, and included the art historian
Louis Dimier and the essayist
Bernard de Vésins. They helped
Charles Maurras (1868–1952) develop the royalist league's pro-Catholic policies. In February 1906 Montesquiou launched the
Institut d'Action Française, where he held the "
Auguste Comte" chair. He wrote three books on Comte and
positivism based on his lectures and conferences. In his ''Le système politique d'Auguste Comte à
la Nouvelle librairie nationale'' (1907) Montesquiou tried to show the disciples of Comte could get along with Catholics. In 1910 he was elected a member of the Comtistes. The decision of the Court of Cassation on 12 July 1906 to annul the conviction of Captain Dreyfus caused a renewed surge of anti-Drefusism among the Action française, with Montesquiou playing a leading role. The League denounced the decision, and violently attacked General
Georges Picquart, the new Minister of War. In April 1907 Montesquiou was officially informed by the Ministry of War that a report on his activity in the Action française had been filed in his dossier as an officer. On 26 April 1907
Le Gaulois published his open letter to Prime Minister
Georges Clemenceau in which he responded to the report by saying he would again put up posters against the rehabilitation of Dreyfus and Picquart. On 16 May 1907 he was suspended from his duties as a reserve officer for one year. Montesquiou held a meeting of 5,000 supporters two days later. Following an inquiry he was dismissed from his rank and employment in the army on 3 September 1907. He continued to campaign against the Drefusards. Montesquiou wrote that the Action Francaise was born from the Dreyfus Affair. In July 1909 he wrote, "We have one goal: Order through the restoration of the King. Well, if this restoration necessitates opposition to the law, violence, and
coup de force, we are ready." During
World War I (1914–18) Montesquiou was assigned as lieutenant to the 2nd Foreign Infantry Regiment. He fought in eastern France and in
Champagne. He died at
Souain, Marne, on 25 September 1915 when leading his section in an assault. He was decorated with the
Croix de Guerre. Montesquiou became part of the pantheon of martyrs of the Action Française.
Jean Baffier was commissioned in 1916 to produce a bust of Montesquiou for the editorial offices of the Action Française. However, his preliminary model was rejected, and the sculptor was forced to consider a suit for
breach of contract. ==Publications==