How do I make this specific trigger?

[Iron Elf]

ok i need some help on SCII triggers. heres what i want the trigger to do

units in region attack to selected region

I cant find anything like this not in the AI section or anywhere. it must be hidden or typed in as some other words. can some one show me a picture of how i might make this trigger?

i will be using it for my special map. basically the AI is supposed to operate when i land on the right region and attack the heros. if you can email me the instructions on how to do it i would like that too

 

[mrzwach]

Pick every unit in the region, issue order to attack move towards the center point of the other region.

 

[Iron Elf]

can you show me a picture of the trigger settings i need? or email me a picture?

 

[AionCannonzSC2]

here is a tutorial video on ordering attack-moves in triggers

http://www.youtube.com/user/OneTwoSC#p/c/32876D80E467558E/0/ySoVD_QKV1g