Monday, June 15, 2015
Thursday, June 15, 1815
Neither Blücher nor Wellington were expecting such a rapid advance so Napoleon gained the element of surprise in the opening days of the campaign [Battle of Waterloo].
The Prussian outposts were quickly overrun and the army was ordered to assemble at Ligny. Napoleon's right, under Marshal Grouchy, pursued the retreating Prussians while the left, under Marshal Ney, marched on Quatre Bras in order to prevent the British army from uniting with the Prussians.