[1] In 1909, when the review Les Etudes changed its format and contributors, he was asked by the editor-in-chief Father Léonce de Grandmaison to write a regular column that would be political, religious and international.

[1] During World War I (1914–18) La Brière actively supported the efforts by Pope Benedict XV to negotiate a compromise peace.

[5] In the autumn of 1926 La Brière had a private audience with Pope Pius XI in which a solution to the official Catholic position on the Action Française short of condemnation was discussed.

[6] At the start of December a circular from the nunciature said bishops should not grant chaplains to Action Française groups because of the risk of confusion between religion and politics.

He visited Yves de La Brière on 8 January 1927, then informed the royalist pretender Prince Jean, Duke of Guise, that La Brière was under orders from the Vatican to form a rival organization in the hope of rallying Catholics from the Action Française, and was hoping for the duke's approval.