Fiery plays: Heroes of might and magic 2 part 15

In this part we returned back in time to choose a different path in one of the early missions. Our new objective is to defeat the dwarves. So far this seems like a fun mission. Apparently my opponent is also only building one castle and leaving the rest of his towns not very protected. It took me a while to gather a strong army but my enemy is stronger still. Next time we will try again and hopefully defeat him. Perhaps I should try taking his castles and towns before fighting his main hero. I could also try hiring a bigger army or beating him with higher level spells.