Help on Triggering a function !!!

[PeterP]

Hello there, I am working on a mod and I ran into a problem...

It may not even be possible, or maybe really easy and I am just dumb for not seeing it, but I really really want to add it in my mod and I have been trying to apply it for days with no results. I have added everything else I want and now I cannot continue without doing it -- or aborting it --

I want to trigger a function when any enemy gets within attack range to the player and I really thought it was simple but I appear to be unable to find it. Can anybody please help?

Note that the mod is a Full Conversion, so you can use the .cfg files in your solution. If anybody knows how to do this, please help. Thanks for your time everyone! ^.-