Oh so one just buys it? Hmmmm!!!!
Yes, basically you take the total number of wounds then you allocate them in pools with each pool going to a different type of warrior in the unit. Each model must have one wound against it before another model can have 2 wounds against it. Each warrior type then makes saves and takes wounds accordingly, if possible wounds have to kill (so in our case one crisis suit would be dead and one down to 1 wound).
So for example:
A 10 man space marine squad with a sergeant and a flamer trooper takes 12 wounds.
You must allocate 8 wounds to the basic troopers, 1 wound to the sergeant and 1 to the flamer. The final two wounds can either go:
both to the normal troopers
1 to the troopers and 1 to sergeant or flamer
1 to sergeant and 1 to flamer
Then you take the saves for each type. So if you took 2 wounds against the Sergeant and he failed both saves, he would die
but the extra wound does not carry over onto another trooper.
The reason it's important is that if the squad has a mix of wargear/weapons (say a terminator squad with a mix of powerfists/swords then each wargear choice counts as a separate pool. For example:
5 terminators with the following wargear take ten wounds:
SB + PS
SB + PF
AC + PF
TH + SS
SB + PS
in the 4th ed rules if you failed 5 armour saves then all of them would be dead, one wound each. Now however you split them so that each would take 2 wounds (The SB+PS would actually take 4 wounds across the two models) and then take saves separately. So if the TH + SS terminator failed 2 armour saves, he would die and the extra unsaved wound would not count against the other soldiers)
It gets even more complicated if you have multi wound models with all different wargear
![Stick Out Tongue :p :p](/styles/default/xenforo/vbSmilies/Normal/tongue.gif)