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I completed the first mission. It was very difficult at the beginning, but once you get your first batch of vampires, even with auto-attack, the computer completes the battles without any losses. By the end of the mission, I didn't lose a single unit. The castle itself is defended ridiculously; those poor paladins were easily defeated by the Death Knights' abilities, they were stunned by mummies, slowed down, while the knights themselves were under acceleration. 60 vampires just stood aside. So, just to be sure, I cleared the mega outpost as well. I really liked the mission; it wasn't tedious, it wasn't long, and the plot was excellent. If the voice actors were real people instead of AI, it would be even better. Now I'm going to play the second mission; I haven't felt this much enjoyment in a long time. (I wanted to insert a screenshot of how I cleared the outpost, but it's a bit difficult to do here, so I'll post a link to Imgur:
https://imgur.com/a/8RUM3a5). It was a mistake not to take the slow spell at the beginning; I had to work hard and attack with acceleration and battle frenzy.