Here are general tips for playing the Empire Campaign in Warhammer: Mark of Chaos on HARD Difficulty. A list of all our Warhammer: Mark of Chaos articles can be found here.
We won't be hand-holding you through absolutely everything, but instead just give tips on situations that we found tricky or that you might not have considered.
Chapter 1: The Call of War
Mission 5: Green Blockade (duel)
Orc Warboss L10. If you are having trouble, just keep up the Parry skill (even at rank 0) and you should win by attrition.
Since the next mission is the last one in this Chapter, after this mission is the last chance to buy whatever you want from the stores/camp.