I'm finding "Difficult" pretty difficult. That's with all nations, but still, the AI is good. Jotunheim's been clever - they finessed me... split their wolf riders into two flanking Groups, one of which i slaughtered with archers, and the other of which snuck around the back to ruin my army formation. They pulled my hoplites away from my archers, allowing the heavy jotuns in to rout my archers and kill my commanders. All 7 commanders - 3 mages, 2 priests, a scout, and a hoplite... 4 of them were heroic
Not heroic enough, I guess.