Something from Christopher Duffy's Eagles Over the Alps, p. 19:

That sound man, the Saxon-born General Johann Hermann, a master of Prussian tactics, was already on the way with the second installment of troops.

However, I heavily doubt whether or not he was 'a master of Prussian tactics'...
He likes 'tiefer Ordnung', which sounds not so Prussian...

https://books.google.com/books?id=9otPAAAAcAAJ&pg=PA114