A way to access an attacking unit?

In this thread I asked for help with a custom damage system: http://www.wc3campaigns.com/forums/s...threadid=19999
Now it seems that the only problem left is that I don't know how to get the attacking unit (it's easy to get the attacked unit, but not the attacking unit).
If this impossible (by now), then please tell me! If not, thn please help me.

Forget about it, I found out, that
returns the attacker.