first off - you're gonna want to make your PoWs - "Sepcaptive true"! Otherwise all the guards will just open fire straight away!
I also think the alarm should give you a bit of a head start...
Say theres a patrolling group that checks each of the huts every now and again.
If the player isn't in the building when they enter it say, then they run out to an alarm and trigger it.
Also - as Im guessing this will be a night break, you could have the guards stop you and force you back to your hut if they catch you out?
I know you probably don't know how to implement a lot of this so far, but most of it is quite simple and can be done without a great deal of fiddling.
But as I said - the most important thing is to set your Pows as captives.
You do this in the "Init" field of the unit's properties in the editor.
Simply type in "This setcaptive true" to make a unit a captive.
To remove his weapon you first need to know what wepaon he has.
Then its simply a case of going back into the "init" field again and typing something like:
"This remove weapon "m16""
Anyway - hope this helps - if you want anything else ask
Dan ;D