Yeah, do something like:
Code:
Events
Each x seconds of game time (or whatever you want, you could also do that when the units spawn it fires this trigger.)
Actions
Pick every units in (Playable Map Area) and do:
If (Owner of Picked units) is equal to (Player x) and Unit Type of (Picked units) is equal to Hero
Then Order (All units owned by Player y) attack (Picked units)
Else Do nothing
I did it without the editor, and it would work only with one enemy hero. It's still pretty easy to do, just use your brain a bit
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