2) as you suggested: I spent almost 6 months building up troops from 4 Necropolises and, after honestly breaking through the gates with minimal losses, I tried to end this "sadomasochistic" endeavor with a blitzkrieg.
Once again, I regretted the lack of leadership, because the first time I had to fight the garrison with -1 morale, and the second time with -2. That was quite unpleasant.
After that, I just skipped to the 12th month again to gather a sufficient force that would allow me to easily win the final battle.
P.S. Lucifer, with 6 castles by the 12th month, turned into some kind of monster. 320 archdevils, almost 700 ifrits, 2K+ pits and cerberuses, 2.7K magogs. You can't take resources from such a force.:D
UPD I replayed it for another month (decided to try to get the boots without using a bug, and also see if I could capture the swamp with fewer losses). The funniest thing is that getting the boots turned out to be even more profitable than last time – I eliminated 196 harpies with losses of only 3 gnolls and a tent.:cool:
https://www.youtube.com/watch?v=KBVjnfO34t4
*