A guy on a horse vs a guy on foot.
Some thoughts:
Substitute the horse's Athletics for the rider's for moving between Zones, which *may* give the rider an advantage in relative positioning, if they aren't *there* to be hit when it comes time for the guy on foot to attack.
Have the horse's stats Modify a rider's skill check (gaining a +1 to appropriate attack or defense rolls).
Allow the rider to make a move and attack without the -1 penalty for a Supplemental action because it is the horse doing the moving.
Have the horse rolling the defense checks, or have the horse's stats Modify a rider's defense check.
Or any combination of the above.
A car full of mobsters trying to gun down some fey.
The two advantage mechanisms are:
The car allows the mobsters to attack and get away with minimal chance of counterattack, which would be reflected in Zone Movement, possibly using Athletics.
The other advantage is relative defense, so the car could count as Armor 1-3 against attacks (the occupants could follow up with their own dodge ability if the Armor block is bypassed).
Two old-fashioned armies clashing, both using cavalry and chariots.
My instinct says this should just be plot background. The outcome of a battle such as this, in a story told at the scale of DFRPG, shouldn't be random, or if the outcome needs to be uncertain, tie it to the PCs' success or failure. Plot expedience should determine which side wins, depending on whether the next step is for the heroes to:
- find another way to win
- simply survive adversity
- follow through on their victory and end the conflict once and for all
- etc.
Strands of Fate has a whole system for dealing with Vehicles. Sadly, my main goal was to figure out how to make a bicycle an asset in a similar conflict, but it didn't scale that far down.