5) You might do a Google image search...there are a trillion (well, no, but a lot) of portraits of the various companies (manyh VERY similar) of the Frontier Battalion. Most have the standard "seated left to right..." comments. You might go through one by one and see if you can ID some of the men.
6) There are a TON of books out there about the Rangers. Check Barnes and Nobles, etc. and maybe you can find the original print.
Just some thoughts. Good luck! Happy Hunting! Andrea