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The opponent didn't succeed. Thanks for the game!
Attacked a Castle owned by the AI on day 117, built a Stronghold in it, and decided to finish off the AI hero who was within reach. I defeated him, but I didn't realize that another AI hero could seize the Castle from the unexplored territory.
That's what happened, and as a result, I couldn't retake the AI's Castle.
Thanks for the game!