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I heard that Godrick doesn't get a knight army on auto-battle. So, in this mission, auto-battle is almost like a cheat.
Added 21 hours 17 minutes ago
I'm replaying this mission now. My Godrick is a well-developed, level 30 knight. It's best not to attack him without a strong army.
At the beginning of the mission, I was surprised that no one had captured my mines. Last time, some invisible ninjas captured the mines and even left garrisons there. This time, everything was calm. After clearing his own island, Markel set out to explore other islands for resources. But then, a message appeared saying that a triple lunar eclipse would occur in N weeks. The message repeated every week, and in the last week, it appeared daily. I prepared to watch the amazing spectacle, but instead of the spectacle, I received the message "Mission failed." Markel was on the Sphinx Island at that time. There are no saves, so I'll have to start over.
Conclusion: after receiving an unfamiliar warning, you should save the game.
I started playing again, and immediately the ninjas captured my mine. I think the triple lunar eclipse won't happen again.