Walkthroughs for custom maps.

Oh, after playing, I realized one thing. I didn't take the "Wisdom" skill with my hero, which is given almost at the beginning of the game. How could I forget about that? Now it's clear why in this walkthrough, he had low mana.

Added 4 minutes later
Accumulating troops helps mainly in areas where there aren't heroes that come out to fight you. But it wouldn't be very interesting to play that way.