Hmmmm check if you got
data\descr_geography_new.txt
data\descr_geography_new.db

Someone in your M2TW folder and subfolders. I made sure to get rid of them in VanillaMod, but if you ever unpacked something on your end, or maybe Ornamentum had those files, you will get the battle CTDs. With those two files deleted, all should work well.

If it continues, try doing some errorlogging (look at the original VanillaMod.cfg from the archive and copy/paste the top part with errorlogging into your current VanillaMod.cfg).
Could be a conflict with the two mods in this case, but unlikely.