Marengo märĕng´gō [key], village, Piedmont, NW Italy, near Alessandria. It was the site of a famous battle (June 14, 1800) between the French under Napoleon Bonaparte and the Austrians under Melas. Melas had almost won when Desaix arrived with fresh troops to bolster the French; Desaix lost his life, but the Austrians were completely defeated and retired to the Mincio.

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