Intelligence of the Battle of Ligny, William Heath
Depicts the moment when a prussian officer informs the the duke of wellington—who was attending the duchess of richmond's ball—that the french have crossed the border at charleroi and that the prussians would concentrate their army at ligny.
Author: Drawn & Etched by W. Heath. // Aquatinted by J.C. Stadler. // London, Published by T. Tegg, III, Cheapside, April 1, 1818.Source: https://commons.wikimedia.org/