On 16 June 1815, the French defeated the Prussians at the Battle of Ligny. The Prussians successfully disengaged and withdrew north to Wavre where they regrouped, and later advanced westward with three corps to attack the right flank of the French army at the Battle of Waterloo. The French were slow to exploit Ligny; Napoleon wasted the morning of 17 June with a late breakfast and touring the previous day's battlefield before organising a pursuit of the two Coalition armies. Napoleon and Marshal Michel Ney took the French reserves to pursue the Duke of Wellington's Anglo-allied army. Marshal Emmanuel de Grouchy was ordered to pursue and harry the Prussians and prevent them from regrouping.