Apologies for the long delay in response.
Questions: Do the ambushers each get a full turn before the victims act? Does one ambusher get a full round and then initiative is rolled? Does surprise end as soon as the first ambusher has acted, or is a victim surprised until he has acted?
You are automatically considered to have won Initiative that Turn. Looks like that was omitted in the Initiative section. In a situation where only some of the enemy is surprised (such that an initiative roll is still needed), you may find that you benefit from the Hold Action mechanism.
If the attack is using Ranged combat, you gain a +2 bonus on the target.
We house ruled (at the time) that we automatically all went first, and thugs automatically all went last... but we decimated them, and we feel that had it been the other way around we would have been in sad shape as well.
The base ATOW rules are harsh, and specifically reward sound tactical decisions, such as laying in ambush, or using overwhelming force.
The flip side is that even a weak enemy can seriously hurt you if they gain sufficient advantages or surprise.
Paul