"Wilderness War" by Allan W. Eckert
Part of a series of narratives he wrote on how America came to be. Basically the series details the frontier period in America, up through the French/Indian war, Revolutionary War (this is the subject of Wilderness War), and so on. The author makes extensive use of old manuscripts, diaries, etc. to recreate conversation and thoughts to make this a very enjoyable though quite long history read. I really dig this stuff. Eckert takes no sides in any of this - just presents what happened based on historical records and what must have been an unimagineable amount of research.
This is the 4th book in the series I have read so far.
"I'm virtually free to do whatever I want, but I try to remember so is everybody else..." - Todd Snider