Orc campaign kinda just...stops?

[Wakrob]

I was on map in the orc campaign that I took a big magic tower then had to backtrack to kill Ash-oon, my traitorious shaman. I killed him, was 'captured' then rescued my leader from some fleeing goblins...then the game just went back to the starting campaign screen after a big speech from Urgruam about continuing on to slain the backstabbing Hexers.

Did I do something wrong? Is there more campaign?

Thanks
Wak

By the way, what makes the hard setting harder? I starting over on hard and it seems the same. Turns to get medals maybe are shorter?