Hi, well, as far as I know, nobody will attack a civilian when they spot him... unless you tell them to do so. Create a big tirgger covering the whole area, and make it be activated by East or West or Resistance, depending on who is the enemy. Now, put in its condition line whatever you want in order to activate it, and in its On Activation field put:
"_x dofire player" foreach thislist
Now everyone will fire at the player (put the name of the player instead of player, for example aP).