I got lucky in the first week; there was a hero from my faction and a dwarven hero with archers in the tavern. On the second day, I found a dungeon within a dungeon in Ossir (I was honestly surprised). After that, I went along the road, expecting to find a secondary town (and I found a Temple). By the end of the second week, I captured an empty enemy town; it was just one tile away from the castle.
The main battle was very easy (although the opponent managed to leave the castle).
Thank you to my opponent for the game.