Füssel comes in two variations. He's written both a lengthy and a short book about the 7 Years War. Both are readable and interesting - language wise, more like Ziebura than Stolberg-Rillinger. Mind you, especially in the lengthy book, he quotes from original documents, some of which were in German which means Rokoko language. But as he really covers the "first World War" aspect, i.e. we get the overseas goings on as well, these aren't a lot.

The Beuys Sophie & Sophie book (as it's really about both of them) isn't as academic as Stollberg-Rillinger, and not nearly as lengthy, either, but it is drier than Ziebura.