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How did conflicting orders affect Jean-Baptiste Drouet d’Erlon’s corps at Ligny?

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Historical battle map showing troop positions at the Battle of Waterloo on June 18, 1815, near Brussels, Belgium. Red lines represent Anglo-Dutch infantry and cavalry under Wellington, positioned north of French forces. Blue lines show French infantry and cavalry under Napoleon, with both armies facing each other across a central road. Key locations like Chateau de Goumont (Hougoumont) and Plancenoit are labeled, and an inset map highlights the location within present-day Belgium and Europe. — Battle of Waterloo Battle of Waterloo, June 18, 1815.

During the Battle of Ligny on June 16, 1815, the corps commanded by Jean-Baptiste Drouet, count d’Erlon was rendered ineffective due to conflicting orders from Napoleon and Marshal Michel Ney.12

Although Drouet’s corps was attached to Ney’s command, Napoleon intended to use the unit to shatter the Prussian right flank at Ligny. Because Ney simultaneously required support at the Battle of Quatre-Bras, Drouet received contradictory instructions that forced his troops to spend the day pointlessly marching and countermarching between the two battlefields.1

This miscommunication prevented Drouet from providing the critical support Napoleon needed to deliver a decisive blow to the Prussian center earlier in the day. By the time Drouet’s column appeared in the French rear, it was misidentified as an enemy threat, causing confusion among French forces. The corps subsequently withdrew in accordance with Ney's orders, ultimately failing to contribute to either engagement as required.12