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The Battle of Coulmiers was fought on November 9, 1870 between French and Bavarian forces. The French Army of the Loire under General D'Aurelle de Paladines surprised a Bavarian army under Ludwig Freiherr von und zu der Tann-Rathsamhausen at the village of Coulmiers west of Orleans. The French artillery detachment shelled the Bavarian camp with percussion-fused shells, causing panic in the camp and causing the Bavarian garrison to retreat in disorder during a direct bayonet charge by French infantry.
The news of Coulmiers was relayed to besieged Paris and caused great excitement in the city, prompting the Government of National Defense within the city to launch "the Great Sortie" against the Prussian siege lines around the city. At the same time, the Army of the Loire continued its march on Paris, against the wishes of General D'Aurelles, who argued that his raw, badly-supplied men needed time to rest.