FIDAC (The Interallied Federation of War Veterans Organisations), the first international organization of war veterans is established in Paris, France.

FIDAC was established in Paris in November 1920, at the initiative of the veterans from World War I predominant pacifists, such as Hubert Aubert, director in UNC , France, and in particular Charles Bertrand, Secretary-General of UNC and deputy in the French Parliament. They had the idea of uniting veterans’ associations established after the end of World War I in various allied countries into an international federation whose main purpose was to promote peace, continuously strengthen the brotherhood initiated on the battlefield, and provide help to the wounded, the disabled, widowers, war orphans, veterans, and also commemorate the heroes fallen in battles. Charles Bertrand, general secretary and future president of UNC in France, thus became the first president of FIDAC (1920–1924).