Final battles difficulties

[TheTallestOne]

Hi,
I´ve got some real trouble with final fights. I don´t know how my level, original skills, items and spells influence 3 heroes which fights on my side, but it´s immposible for me to win with dwarfs. 5 of 6 units are useless and no serious spell available.

I already tried with Elfs and Vikings with no problem, but dwarfs sux hard (eg Enginner is dead before I even start the fight!).

Any hint or strategy? I play on Normal, original level 51, mage.

thx