[1] Raffin-Dugens stayed true to his pacifist principles after the outbreak of World War I (July 1914 – November 1918).

The Confédération générale du travail (CGT, General Confederation of Labor) leaders Alphonse Merrheim, Albert Bourderon and Marie Mayoux were expected to represent France, but were refused the passports they needed to travel.

[4] On their return from Switzerland, the three deputies were the targets of a violent press campaign in which they were accused of being defeatists, traitors and spies.

[5] Writing in Le Populaire on 3–9 July 1916 Jean Longuet said the stance of Brizon, Blanc and Raffin-Dugens was courageous, in strong contrast to that of the other elected socialists.

They voted with the SFIO minority, in favor of accepting U.S. President Woodrow Wilson's offer to mediate peace.

[7] In February the Committee for the Resumption of International Relations split, with Raffin-Dugens, Bourderon and Brizon joining the SFIO minority led by Jean Longuet, while the Socialists Fernand Loriot, Charles Rappoport, Louise Saumoneau and François Mayoux took control of the committee.

[8] On 11 November 1918 Raffin-Dugens was the only deputy to vote against a national tribute to the armed forces and to President Georges Clemenceau and Ferdinand Foch.