So the game CTD when I kill the Isengard Chief. Im playing as Rohan and I killed Saruman right away. Then I got ambushed by the new faction heir and a general. I killed them both. Then I saw their chief was all alone so I went to go kill him. After I killed him and the game returns to the campaign map the game crashes. I know there is another general with a giant army(which I have no idea how they got, 1 turn it just showed up).

I also know there was another thread about this but it got closed before I could post. I am not using any submods and I just started this campaign today and I had the 3.1 patch since saturday.