I've found three more books but it feels like this is it, to be honest. Every search term I use brings up the same few books over and over. I've added them to the list but also included them below to save you looking through again trying to figure out which three are the new three.
De Ligne was an officer from the Austrian Netherlands who served in many of the major battles of the Seven Years War including Leuthen. There are a good 40 or so pages devoted to that period in this book as well as a dozen or so more related to his time spent with Frederick the Great after the war.
By O. P. Gilbert