 During the first session of the Council Oliveira provided a secretariat which served Brazilian bishops Antônio de Castro Mayer and Geraldo de Proença Sigaud and other bishops of the traditional faction, who ultimately formed the "Coetus Internationalis Patrum".Corrêa de Oliveira's opposition to the direction of the Council continued, and in a 1976 addendum to his book, "Revolution and Counter-Revolution", he described Vatican II as "one of the greatest calamities, if not the greatest, in the history of the Church".His strong opposition led to him being described as a "revanchist" within the ultra-traditional faction.