I tried this battle a few times because I really wanted to get the casualties down and the enemy's oathsworn were pulling off insanely high kill numbers.
I finally won the battle with just over 600 casualties (auto resolve had it at almost 1000) but in those 600 was my main general. I rewatched and couldn't believe how I lost him. Ironically enough this was both the only time he died in my multiple trials but I also slaughtered the oathsworn with 4 basic, fresh recruited javelinmen on skirmish mode where as before I couldn't even beat them when surrounding them multiple trarii and cav charges without 200 deaths on my side. I can't help but laugh.