When the "Army of the North" attacked the forces of the Seventh Coalition in the United Kingdom of the Netherlands, Kellermann, with Lhéritier's division, was placed under the command of Marshal Michel Ney. On 16 June, Ney faced a massed Allied force at the Battle of Quatre Bras. Of Lhéritier's 11th cavalry division, only Guiton's cuirassier brigade was present and available for action. As Ney's situation became increasingly desperate, the Marshal ordered Kellermann to take his cuirassiers in a frontal charge against the enemy. The charge was very well handled and, despite the difficult terrain and the large numbers of the enemy, it did much to relieve the pressure on the French forces. At first, it broke Hugh Halkett's forces, then Frederick William, Duke of Brunswick-Wolfenbüttel's German infantry, eventually reaching the crucial Quatre Bras crossroads. However, this breakthrough could not be exploited, as no other units had been sent in immediate support of the heavy cavalry. The cuirassiers endured some close-range musketry before finally turning and retreating at a trot, a manoeuvre during which Kellermann had his horse shot under him and barely escaped capture. Two days later, the entire III Corps was reunited under Kellermann's command and was available for action at the Battle of Waterloo. Lhéritier's division was committed towards 17:30, during the afternoon attacks, as Ney sent in his cavalry in mass against the Allied centre. A series of charges ensued, but such a cavalry attack, without proper infantry or artillery support was always set to fail on an uneven battlefield such as the one at Waterloo and against an infantry that had plenty of time to form protective squares. Despite the effortsof the French cavalry – Lhéritier's division alone lost six officers dead, three mortally wounded and forty wounded – the battle was lost. During this action, Lhéritier received a bullet wound to the right shoulder.