Your trigger would have whatever event you would need to have the units spawn when you want them to. Then you would use the action Unit - Create Units Facing Angle to create the units, and then Unit - Issue Order Targeting a Point to order the created units to attack-move to your desired location.
Author: Shura
Board Game: Othello (or Reversi)
Description: Place tiles to capture pieces, and try to have the most tiles at the end.
Notes: The map isn't completely done yet. Only has Single Player vs A.I.
My computer got a virus and took forever to get fixed, then I had to spend the last week getting caught up in everything, and now I'm going on vacation, so I haven't had any time to finish my map. I'll upload what I have, and if there happens to be another extension, I'll finish it up when I...
You could have all unit's sight range very short at the beginning, and have sight range given by dummy units. Then you can replace the dummy unit with one with shorter sight range to decrease the unit's sight range.
In the object editor you want to create a new ability based off of Item Life Bonus, and adjust it so that it gives the amount of hit points that you want.
Make a trigger that would periodically check all units with the aura buff, and have it add Item Life Bonus, and remove it when the unit no longer has the buff.
Try making a trigger that will add the event when a unit enters the map instead of when the ability is cast. Then you won't need your first trigger, the ability will just need to apply the buff.