Editing Battle of Waterloo (section)

===Napoleon spots the Prussians===
At about 13:15, Napoleon saw the first columns of Prussians around the village of [[Lasne-Chapelle-Saint-Lambert]], {{convert|4|to|5|mi|km}} away from his right flank—about three hours march for an army.{{sfn|Barbero|2005|p=136}} Napoleon's reaction was to have Marshal Soult send a message to Grouchy telling him to come towards the battlefield and attack the arriving Prussians.{{sfn|Barbero|2005|p=145}} Grouchy, however, had been executing Napoleon's previous orders to follow the Prussians "with your sword against his back" towards Wavre, and was by then too far away to reach Waterloo.<ref name="Daws2017"/>

Grouchy was advised by his subordinate, [[Étienne Maurice Gérard|Gérard]], to "march to the sound of the guns", but stuck to his orders and engaged the Prussian III Corps rearguard, under the command of Lieutenant-General Baron [[Johann von Thielmann|von Thielmann]], at the [[Battle of Wavre]]. Moreover, Soult's letter ordering Grouchy to move quickly to join Napoleon and attack Bülow would not actually reach Grouchy until after 20:00.<ref name="Daws2017">{{cite book |last=Dawson |first=Paul L. |title=Napoleon and Grouchy: The Last Great Waterloo Mystery Unravelled |url=https://books.google.com/books?id=u2HNDwAAQBAJ&pg=PT309 |publisher=Pen & Sword Books |year=2017 |pages=309– |isbn=978-1-5267-0069-8}}</ref>