Geronimo is an interesting character; people either loved or hated him. Also, while he conducted his operations against the Army masterfully, there were times where he was slack to the point of not even bothering to post guards and on several occassions his camp was surprised. Only quick action saved him.
If you're looking for a good overview, this is a good place to start. The only problem is keeping track of Geronimo's movements- the maps help but they could be better.
I'll comment more soon.