There were tens of thousands of beasts and humans fighting, so the battlefield was extremely chaotic. The Nationalist had a few of their Humvees destroyed and lost some grunts, but the majority of the deaths came from those that were unaffiliated with them. Rankers that happened to live in the northern region and knew that if they did not join the fight then it was likely that the Nationalist would kill them after all of this was over. This was also a chance for people to train and gather beast cores.