Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
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Attack cleanup wrote:
If the combat was won by the attacker, remove any Order token the defender had assigned to the embattled area (if one remains) as well as any Power token in the area (which would exist if the defending player had previously established control there, see page 24).
1. When the attacker wins, the defender's march order is removed.
2. Resolve march order normally.