Sorry, the mission failed :(
Apparently, you can't attack a Sigrif with a Markal :(
But overall, it's a pity. I recruited 500 High Liches, put them all on the mine, except for 7 stacks of vampires with 2 mage items. I decided to give Sigrif a good beating. I did... And they gave me a defeat. Cities are inaccessible for attack, okay, fine, I'll run to the portal and the haven, but I hope I can at least beat other demons and they won't give me a defeat :( ((
In general, if he had a wave of fire, I wouldn't have been able to win this battle :)