I have and played osme battles with no problems.
What enemy units are in troop, and check which have highest initiative, so we know who makes problem.
There is orc saboteur bug that caused them to crash game but was fixed here :
http://forum.1cpublishing.eu/showpos...&postcount=103
And say did you moded some game files by yourself, i did try to change some things on my own, to see how it works but later retuner to original settings maybe you forgot to fix something you changed before.