Luckily, there were 3 resource sites close to each other on the map, and a couple of gnome dens nearby. By the end of the month, I had taken everything and went looking for an opponent. I received 9 angels and 16 wyverns. When I found the opponent, there was no army in the castle, so I took it without any problems. Later, it turned out that the opponent had miscalculated the number of griffins in the resource site and lost almost his entire army, so there was no real fight.
Thank you for the game.