🚀 go-pugleaf

In the Starcraft editor make a map, go to the "location layer" make two
locations by drawing a box.  Double click on them to name them. Name
one "BringMasserHere" and the other "AttackHere"

Then go to the "Unit Layer" and create a mass attack guy (use a
civilian or whatever you want) and a beacon.

Go back to the location layer and move and size the "BringMasserHere"
location on the beacon.  Then move and size the "AttackHere" to where
you want them to Attack.

Go to scenario-->Triggers- make a new one --
Players = all players
Next
Conditions---> select new --> BRING
PLAYER brings UNIT to LOCATION
---> Click on the underlined blue words:
 Player = current player
 Unit = terran civilian under "Heroes" -- (or whatever you decide to
use)
Location = BringMasserHere
Next -->
Actions--> select new -->ORDER
 Order UNITS at LOCATION ORDER to LOCATION (something like that, i am
doing this from memory)
UNIT= Whatever unit you want to perform the attack
>>(You could select all units, however i do not recommend it: Even the civilian would try to attack. If you want every unit Except the civilian, and maybe your workers to attack then you will need to make Multiple actions (one for each unit that you DO want to attack) by repeating these last steps over and over and over again)
LOCATION = Anywhere
ORDER = Attack
Location = "AttackHere"

Finish!

Now when you bring the Civilian to the beacon the units specified will
attack to "AttackHere"