Well OF COURSE IT'S EASY, because you possess the power of MIND CONTROL for half of the game...
[spoiler]I honestly attempted the same thing also. Havent played since a few of my best captains died...[/spoiler]
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IT'S SO EASY [spoiler]I tried to play through Nurn by having one Captain fight the whole board, but they got killed every time, usually after killing 1-3 other Captains [/spoiler]