Manuscript, pen-and-ink and watercolor. Has watermarks. Relief shown by shading. Shows fortifications, fields of fire, and position of French naval vessels. Oriented with north to the right. Includes index to defenses. Note on manuscript label originally mounted on verso: A joindr ̊ ̉lettre de M. de Rochambeau au Prince de Montbarey datě 19 juillet 1780.
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