Due to the large distances in the zones, I decided to take Arghat. I encountered education, machines, and defense, but they weren't offered until level 23. On the second day, I was in MT, looking for a teleport to the opponent. On the last day, I found it, and there was also a teleport to the starting location nearby. I reached the castle and, with a marching speed, attacked the redeemed troops without a hero.
Thank you for the game. Good luck.