The Battle of Quatre Bras was fought on 16 June 1815, as a preliminary engagement to the decisive Battle of Waterloo that occurred two days later. The battle took place near the strategic crossroads of Quatre Bras and was contested between elements of the Duke of Wellington's Anglo-allied army and the left wing of Napoleon Bonaparte's French Arme du Nord under Marshal Michel Ney. The battle was a tactical victory for Wellington (as he possessed the field at dusk), but because Ney prevented him going to the aid of Blucher's Prussians who were fighting a larger French army under the command of Napoleon Bonaparte at Ligny it was a strategic victory for the French.

The Battle of Ligny was fought on 16 June 1815, in which French troops of the Armée du Nord under the command of Napoleon I defeated part of a Prussian army under Field Marshal Blücher, near Ligny in present-day Belgium. The battle resulted in a tactical victory for the French, but the bulk of the Prussian army survived the battle in good order and played a role two days later at the Battle of Waterloo, having been reinforced by Prussian troops who had not participated at Ligny. The Battle of Ligny was the last victory in Napoleon's military career.