http://greensleeves.typepad.com/berkshires/2007/08/index.html (start with the August 19th entry) These are 7 or 8 well-written and lengthy articles, with lots of period maps and portraits. The author also mentions his ancestors' roles in the campaign.
Every August, there is a reenactment of the Newtown battle at The Newtown Battlefield State Park near Elmira NY on Rte 17. You can find out more by going to the following site chemung valley Living history center YMH & OS, Uncle Ben