Scenario: A plague wipes out the Kushan, Parthian, Hatra, and Osroene nations sometime around 200 AD. The Romans and Hans send in their full military force to conquer the undefended lands. Eventually the two armies meet and a war erupts.
Scenario 2: Roman Army start in Fort Collins CO, Han Army start in Pueblo CO. State in un-populated.
No outside interference from other factions.
Decide your own victory conditions.