Many thanks, very helpful. Would it be correct to assume Saxons were in ~500 man battalions? A post on another form said they were formed up at Breitenfeld in 1000 man units.
What sources do you use for the Saxons during this time period (and the Northern Wars) if you don't mind me asking?
The Saxons started the War with the Spanish Ordonance, calling for the formation of Tercios. It was only at later times and many lost encounters as well as the contacts with the forces of Wallenstein that they adopted the system of the Dutch Ordonance. So they left unit strengths of 1000-2000 men behind them and formed smaler bodies of 500-700 men.
The recources? Well, I have to confess that most of the knowledge came from a good friend and fellow wargamer long gone now. He shared all his knowledge with us and also had written his own rules about the times he was interested to.
The few remaining resources of my own are
"Battles in the Thirty Years War", William P. Guthrie, Greenwood Press
"Gefechtsformen der Infanterie in 800 Jahren", Herbert Schwarz
"Geschichte der saechsischen Armee", Schuster & Francke
and some notes in
"Denmark in the Thirty Years War", Paul Douglas Lockhart
Hope that helps,