Just now saw your message from January. I am happy to email what have on Bailey Grinnell. Never was able to find any conclusive evidence that he took part in Barton's Raid. But it seems he served with a unit where volunteers could have been requested. The most interesting was getting his application for his government pension where he outlined his military service.
Let me know if you are looking for anything particular and i would be happy to email what i have off to you.