I have a question. Watch the video; it contains information.
https://www.youtube.com/watch?v=fmkIr4mjTIQ
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The problem is a lack of troops. Also, why are you going to only one crypt when there are four? Replay until you get the desired outcome. Here, everything depends on random chance.
Okay, I figured it out myself. In this example, the game difficulty is set to easy (80%). The AI behavior is different!