The Comte de Gisors, the popular, charismatic, only child of the French minister of war, the Duc de Belle-Isle, was mortally wounded while charging at the head of the French Carabiniers. The Comte de St. Germain, who commanded the French left wing, was nevertheless able to put together a sufficient defense to prevent a complete rout, and the French army retired from the field in relatively good order.

The Erbprinz, son of the ruling Duke of Brunswick-Wolfenbüttel, who later died of wounds received at the battle of Jena during the Napoleonic Wars, particularly distinguished himself commanding the allied flanking troops. Clermont asked to be relieved of his command after this defeat, and his wish was granted. He was succeeded in command by Marshal de Contades.

For this entry, I have copied wikipedia verbatim, it was a conveniently concise article. However, a much more detailed article can be found here:
https://www.kronoskaf.com/syw/index.php?title=1758-06-23_-_Battle_of_Krefeld