To Schicklegruber:
Well, if the two teams just sit there, it probably means they are both allies. Chane their diploomacy and make sure they're both enemies against each other.
To make one side take he defensive, wel that's tricy, but you could try bulk object tasking, so the Computer side is geenrally directed to one location. There are also different AI Mods out there that could help you.
I hope this helps.
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To Dark Force User:
Yes, you can. It involves loop triggers, as Astro Mech so kindly explained to me. You should not only read the replies to your own questions, but the replies to others as well. Because sometimes thing like this happen, the same questions are asked one after another.
Since I don't really mind explaining, I will:
Create Trigger: "Ambush"
Display as Objectives: No
Starting State: On
Trigger Looping: No
Condition: (Condition you want before the ambush occurs)
Effect: Activate Trigger "Ambush Units".
Effect: Create Trigger "Ambush Units 2".
Create Trigger: "Ambush Units"
Display as Objectives: No
Starting State: Off
Trigger Looping: Yes
Condition: Timer (1 second)
Effect: Create Object (Objects you wish to create and set the location they appear around)
Create Trigger: "Ambush Units 2"
Display as Objectives: No
Starting State: Off
Trigger Looping: No
Conidtion: Timer (Input the amount of units you wish to have appear, but the MAXIMUM (and I mean it) of units you can have appear is 25)
Effect: Deactivate Trigger "Ambush Units".
There, I've given you the trigger instructions to create objects in up to 25 units in one place at a time. They will spread themselves out, don't worry.