Get the Imperial Assault Campaign module for Vassal from http://www.vassalengine.org/wiki/Module:Star_Wars:_Imperial_Assault
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I don't remember anything that would use "in front of entrance", but there are a number of missions with "on the entrance".
Rules Reference Guide, Entrance wrote:
Entrance refers to the space containing the entrance token.
Heroes are deployed to the entrance token at the start of a mission
in a campaign.
I think you need this too:
RRG, Escaping wrote:
Certain mission rules can allow a figure to escape. In order to
escape, the figure must spend one movement point while in or
adjacent to the space indicated in the mission's rules.
After a figure escapes, remove that figure from the map. That figure
cannot be affected by abilities, and cannot perform activations.