How do I set an entire side's behaviour using a trigger?

[laverniusregalis 10]

I'm trying to create a stealth mission that will cause the entire EAST faction to go into combat mode if the player is detected. Is it possible to set the entire EAST faction's behaviour via a trigger?

Edited July 3, 2013 by steamtex

[kylania 567]

{if (side _x == opfor) then {_x setBehaviour "COMBAT"}} forEach allUnits;

[laverniusregalis 10]

Thanks!