Brumaire brümâr´ [key], second month of the French Revolutionary calendar. The coup of 18 (actually 18–19) Brumaire (Nov. 9–10, 1799), engineered chiefly by Sieyès, overthrew the Directory and established the Consulate under Napoleon. It nearly failed because of Napoleon's inept conduct at the Council of Five Hundred, but the situation was saved by his brother Lucien Bonaparte.

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