How do i make an enemy hold fire????

[ICMTRIGGER]

I need and Enemy Unit to Hold fire until The west get to a certain point does anyone know how to do this if so please write back thank you

[m21man]

Name the enemy unit something like enemyunit1
In enemy unit's init field:
this setcombatmode "green"

In a west-activated trigger at the "certain point", put this in the on activation field:
enemyunit1 setcombatmode "yellow"