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It was also by his advice that the commander in chief, Jean-Baptiste Jourdan, discovered Josias, Prince of Coburg's unfortunate position behind the Wattignies forest, compelled him to retreat across the Sambre and subsequently lifted the siege of Maubeuge: Ernouf's part in this action, the Battle of Hondschoote, earned him his promotion to Major General on 23 frimaire an II (13 December 1793).