"Fire Once In Weapon Range" of Zone/Group or Unit Trigger

[rwbishUP]

Would be handy to have a trigger for ground units, (i.e. MLRS and other fairly long range artillery that don't have to have a visual). That would instruct a unit, or a group as a whole maybe based on the unit with the shortest weapon range. That would trigger units, to automatically stop along their route and begin firing toward a set zone or group, once in range of that target, not having to have a visual on the tgt. In order to keep from having to use advanced scripting, or a lot of stacked triggers and flags.

If this function already exists, I apologize for the post, but I can't find anything that simplifies the function.