If you are going to do Pony Wars, as it was done in the UK conventions, then this is the list of the figures that were used for those games. You probably wouldnt need all these for smaller games, but it shows the variety of whats needed:

240 x US Cavalry figures,  24 men per troop = 10 troops

80 x dismounted troopers

?  horse holders  ?

8 x 12-pdrs and crews

2 x Gatling guns and crews

10 x limbers and crews

1 x ammunition wagon

20 x Indian Scouts,

20 x Volunteer Scouts,

40 x US Infantry figures

10 x US Infantry Fort Garrison

1 x Scout Dando

3 x wagon trains of 4 wagons each

5 x farm wagons

70 x dismounted civilians

20 x mounted civilians

1 x gun-runner wagon

1 x stagecoach

1 x war wagon

1 x Lone Ranger and Tonto

1 x Pony Express Rider

30 x Longhorn cattle

1 x chuck wagon

1 x Chief Bald Eagle

600 x mounted braves

100 x dismounted braves

50 x assorted squaws and villagers,

2 x model smoke signals

30 x Buffalo (one white)

6 x Buffalo hunters & skinners wagon

To which I would add:

1 x Iron Horse steam train and carriages

1 x Doctors Surrey

2 x Rancher buckboards

1 x Snake oil seller high sided show wagon

2 x Comanchero gun runners wagons

2 x pack mule trappers convoys (10 mules each)

Aye, the whole thing about Pony Wars was it wasnt historical, it was pure Hollywood. Would be interesting to know whats planned for the range.