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The First World War has been described as an exceptional moment of comradeship, so great that it was able to break even the strongest class barriers. Were social distances and class hierarchies temporarily forgotten or abolished for the millions of Frenchmen of diverse origins who were called to arms in defense of their country? The article is about this novel experiment, provoking encounters and contacts on a huge scale and often for the first time, between an overwhelming majority of manual workers and petty employees of humble extraction, and a small number of bourgeois and intellectuals. It tells the story of the discovery, by the French bourgeoisie of the Belle Epoque, of the ordinary people who fought in the trenches.