I got an easy win in chapter 20 of Thracia, which is otherwise very hard. Basically Asbel got a lucky vigor when he was near the main boss (20% chance to move twice in a row) and could finish him in one round and THEN in the next turn he dodges 3 ballista shots with a 45% hit chance each which would've killed him. This allowed me to clear the rest of the level easily, since killing the boss cuts off reinforcements.
Now I feel like I didn't deserve the win.