Map overview:

Situation:
Offence: Bandits
Defence: Cowboys
Spawn points:
Bandits: 1 plateau
Cowboys: 4 On lookout, Behind outhouse, 2 shacks on bluff
Map:
Bandit spawn: southwest corner
Bandit Exit: northwest corner
Loot room: south 2nd floor, main building
NE guardhouse: east
Map Highlights:
This is the smallest map of the wild west, but still a challenging one. The nice twist is that the bandits are the good guys and the cowboys the bad. The Bandits have 2 (or 3 if they blow the hideout gate) routes to the loot room, but the cowboys have all sorts of places to be waiting for them. Then once they've blown the loot room safe and grab the harmonica they will then have to work their way across the map to the exit with the cowboys spawning all over the place.
Tactics Cowboys:
Guard the loot room. There are 3 ways (2 if you can hold the guard house gate) for the bandits to get in so cover all 3. If the bandits get the harmonica then stop them from reaching the exit. Odds are that if you died in the battle to get the harmonica then you will re-spawn between them and the exit.
Tactics Bandits:
You will need a Minor to blow the safe. There are 2(3) routes in: Canyon on south side, climb up the spine of the ridge in front of exit and across bridge, or blow the gate at the guard post on east edge of map. Also be creative and call for backup if you have the harmonica for the cowboys will know where you are going and be waiting to cut you off at the pass.