I found this website while looking for certain pictures and I am really glad I did. Not only can you view hundreds of publications released by the Department of the Army online, but for a few bucks you can order them as well. There are a lot of in-depth books on many, many various battles, documents, and personal accounts of different things. To view the publications, from the French-Indian war to what they have labeled as Contengincy Ops, click on Online bookshelves. Have fun!

http://www.army.mil/cmh-pg/