causalties more then 6 then fal back

[Commando]

I searched but i couldn't find what i was looking for so im posting this here,
I have seen somehwere that you can check if a squad reaches 50 percent or something like that  and then you can activate a new objective or something  ;D like fall back   how do i do it? It has something to be with a trigger or two and some few lines of code that i cannot remember at the moment how to  do  

[StonedSoldier]

trigger and have a marker or something indicating where the squad is going to fall back to

condition : (count units GROUPNAME) < 6
activation: {_x commandmove getmarkerpos "fallback"} foreach units GROUPNAME

[Commando]

i've put in the stuff , didn't give me any errors, but i haven't gotten ny chance to see if it works yet  
maybe later today   i will go to a friend to show off the mission today , so i will hopefully see itn working then