Here we go, from John Franklin,
Oberjäger Carl Wilhelm Pöhling of the 2nd Company, Grey Jäger of the Avantgarde. Pöhling was wounded during the fighting in the Bois de Bossu, and did not serve at Waterloo. His letter, dated 17th July 1815, written to his brother, is fascinating and includes the following extract (translated from German):
‘Our captain ordered the front section to extend […] […] the wood. We had hardly undertaken this movement when the French cavalry came on very rapidly. Our beloved duke and our comrades in the Leibbataillon were the object of this attack. The shock threw them into confusion. A number of the French Dragoons dismounted and began to fire upon the brave Brunswickers. It was during this attack that our father, the duke, was killed.'