Found a cool scenario in Pike and Shot so of course I need some backgound reading, but Amazon is decidedly lacking in recommendations.
There's a Great Generals book that had a large section on Gustav in it. Read it a number of years ago. Also had sections on Turenne and some others from that period. Couldn't find it but I did find this one:
https://www.amazon.com/Gustavus-Adolphus-Succession-Detailed-Campaigns-ebook/dp/B0092XQLHM
Thank you Bob.
For a wargamer, the best I've read is "Battles of the Thirty Years War", White Mountain to Nordlingen by WP Guthrie.
He was a wargamer and his interest in tactics, weapons, battle reports, and logistic methods are very in depth and useful.
His orders of battle are often down to independent companies.
https://books.google.com/books/about/Battles_of_the_Thirty_Years_War.html?id=8UZo2UBMdKYC
I think the publisher is out of business, so you'd need a used copy, or can get through interlibrary loan.
He grabbed me with the account of Breitenfield. Pappenheim's five cavalry assaults had never made much sense, but his narrative, and explanation of the different tactics that the two armies used, made it much clearer.
^Great! Thanks Bes.