Help Needed for a Trigger

[Andykiller]

How Do I make a unit use a Power Using a Trigger?

 

[rulerofiron99]

I usually detect it on attack.

Event: Unit is attacked
Condition: Unit - (attacking unit) is equal to (your unit)
Action: Order (attacking unit) to cast (your spell) targeting (attacked unit)

 

[Andykiller]

Thank you so much Rulerofiron99!