For beginners only: learn from the mistakes of others.

Excellent analysis. Thus, we have identified the following inaccuracies: 1. Moving with slow units. 2. Unjustified reduction of troop morale due to skeletons. 3. The maneuver was correctly identified: after capturing the upper left castle, it was necessary to buy a hero there and, with part of the troops, finish off the remaining hero of the opponent near the castle; the other hero should go down to capture the lower castle. 4. The game plan was correctly identified: 3 heroes immediately go to the castles. I agree with the assessment of the minimum time to complete this map: 3-4 days. 5. I would add one thing: an inaccuracy was also made at the stage of choosing a faction. It would have been better to choose the Warlock faction. They have gargoyles and no zombies:))).