Plan de la piece 124 de la chenau qui fait connoitre qu'elle peut etre la marche de l'ennemi sur cette piece et l'effet des fourneaux de l'assiege pour s'y opposer.
Signed at lower right: Bouan.; Finished, colored plan of part of the defenses of Rosières, France, showing the locations of mine galleries and the radii of effect of those set off.; Plan relates to Prussian siege of the place in 1792 and shows their siege parallels.; Table of references identifies features of the plan.
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