Question on battle turn limit

[Peter Ebbesen]

IIRC it is 50 turns to auto-rout for attacker, 75 turns to auto-loss for attacker.

This mechanism exists to make sure that battles end, as there are a any number of combinations of troops and magic in Dominions 3 that would otherwise result in never-ending battles.

And yes, if you want to play around with berserking troops, which is just one of the ways to run up against the limit, you should be prepared to lose them if the enemy is capable of outlasting you. The most common example of this is attacking a skellyspammer.