Austrians storm the Prussian camp at Hochkirch, catching Frederich by surprise

The German General Staff study of the First and Second Silesian Wars and the Seven Years War remains a classic secondary source for a detailed study of the conflict. Luckily it is available to download as a .pdf file from the links below. There are several different scans of several of the volumes but I have selected those from the Robarts Library at the University of Toronto as being both the most readable and the one that provides the clearest scans of the maps at the rear of most volumes.

Die Kriege Friedrichs des Großen
Grosser Generalstab. Kriegsgeschichtliche Abteilung II (editor Eberhard Kessels)
Teil 1: Der Erste Schlesische Krieg
Band 1	Die Besetzung Schlesiens und die Schlacht bei Mollwitz	https://archive.org/details/diekriegefriedr05iigoog
2 & 3	(in einem Band) Von Mollwitz bis zum Beginn des Mährischen Feldzugs	https://archive.org/details/diekriegefriedr04iigoog
	Der Feldzug in Mähren und der Feldzug in Böhmen und Oberschlesien

Teil 2: Der Zweite Schlesische Krieg
Band 1	Böhmen 1744	https://archive.org/details/diekriegefriedrit2b1prus
2	Hohenfriedberg	https://archive.org/details/diekriegefriedrit2b2prus
3	Soor und Kesselsdorf	https://archive.org/details/th2bd3diekriegefriedri03prusuoft

Teil 3: Der Siebenjahrige Krieg
Band 1	Pirna und Lobositz 1756	https://archive.org/details/diekriegefriedr01iigoog
2	Prag 1757	https://archive.org/details/diekriegefriedrit3b2rus
3	Kolin 1757	https://archive.org/details/diekriegefriedrit3b3prus
4	Gross-Jägersdorf und Breslau 1757	https://archive.org/details/diekriegefriedrit3b4prus
5	Hastenbeck und Rossbach 1757	https://archive.org/details/diekriegefriedr04armegoog
6	Leuthen 1757	https://archive.org/details/diekriegefriedrit3b6prus
7	Olmütz und Crefeld	https://archive.org/details/diekriegefriedrit3b7prus
8	Zorndorf und Hochkirch 1758	https://archive.org/details/diekriegefriedrit3b8prus
9	Bergen	https://archive.org/details/diekriegefriedrit3b9prus
10	Kunersdorf	https://archive.org/details/diekriegefriedrit3b10rus
11	Minden und Maxen	https://archive.org/details/diekriegefriedrit3b11rus
12	Landeshut und Liegnitz	https://archive.org/details/diekriegefriedrit3b12rus
13	Torgau: Die Ereignisse von der Schlacht bei Liegnitz bis zu den Vortagen der Schlacht von Torgau	https://archive.org/details/diekriegefriedrit3b13rus

The study only goes up to 1760 and it was not until 1992 that the draft manuscripts of the final volumes was found in the Potsdamer Heeresarchivs/Kriegsgeschichtliche Forschungsanstalt des Heeres Manuskripte. These have now been published as Thomas Lindner (Hg.), Eberhard Kessel - Das Ende des Siebenjährigen Krieges 1760-1763 (Teil 1: Torgau und Bunzelwitz, Teil 2: Schweidnitz und Freiberg. Textband und Kartenschuber) by Verlag Ferdinand Schöningh which is as complete as the series is likely to be.