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A brown-water navy or riverine navy, in the broadest sense, is a naval force capable of military operations in inland waters and nearshores. Brown-water navies have existed since the ancient era, since ancient Egyptians fought on the Nile, but the described term originated in the United States Navy during the American Civil War, when it referred to Union forces patrolling the muddy Mississippi River, and has since been used to describe the small gunboats and patrol boats commonly used in rivers, along with the larger "mother ships" that supported them.