The beginning was tough, with only one secondary hero, and obstacles along the way. By the time I reached the enemy, I had about a dozen butterflies and 6 air units left, but my secondary hero had a water splash ability.
After that, it was similar to my loss in the interportal map - I used a logistics hero to gather resources, my secondary hero, 8 angels, and then used "Go" on the second turn. On turn 127, I didn't quite reach the enemy castle with one unit, but I blocked the exit, and on turn 131, the red player surrendered.
Thank you for the game.