I would hardly say "every engagement". There were a couple of times where we actually broke the siege line and had the imps running. Besides, according to OP this event was based on objectives of capturing the base, not kills. Last event was a kinda draw because I told the ops group to head to Dorn, sacking the drift hills outpost on our way, eventually devastating the main imp ops group in their main base while the recon imp group killed the guards at Aurek.