When did Wellington order the general Allied advance at Waterloo?

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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.

At the Battle of Waterloo, the Duke of Wellington ordered a general Allied advance at approximately 8:15 pm on June 18, 1815. This command followed the defeat of the French Imperial Guard and signaled the beginning of a disorganized withdrawal and eventual rout of the French forces.1