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I read the previous posts. I was very surprised that people have spells like resurrection and phoenix. In the native and Necropolis Castle in version 1.5, the Mage Guild is limited to level 2. There are no places where you can get high-level spells.
The quest "Liberate the Silver Cities" reminded me of the 3rd mission of the 3rd Campaign. The map turned out to be very similar. Only the objects on it are different.
I started on an island with one city. Markel captured it first. From the very beginning, enemies attacked from two sides. I barely managed to defend myself. Then their activity subsided, and I had the opportunity to clear my island. When I defeated the dragons guarding the shipyard, I immediately sent a support hero to sail.
Zephir went to the teleport. He ended up not far from the northwestern city. Markel captured it second. There was a weak garrison, and the Castle was almost not built. I didn't rebuild it because I hoped that the cities cursed by the nasty Markel would somehow magically turn back into Academy cities. I was wrong.
Then I went south and, with considerable losses, captured the southern city. Markel captured it last, but cursed it first. It was fully built. I completely forgot that there was a third city on the mainland - the one near which the cowardly Cyrus fled from Markel to the Dungeon.
I got on a ship and captured Novostrozhensk and Mythograd. The losses were terrible. Zephir had only a few Titans and Rakshasas left alive. I found out that you can build a 5th-level Mage Guild in Novostrozhensk. I thought that the mission would end with this. But after it was built, even the quest "Build a 5th-level Mage Guild" remained unfulfilled. I received the spells "Teleport" and "Holy Word". Only then did I remember about the last city.
I bought a Necromancer hero. In the tavern, as in the previous mission, there was Deidra. I bought everything that had accumulated in the built Castle and sent her to break through the garrisons. She found the last city, and then a spell-boosting building. Along the way, she leveled up to level 11. In the city, there was an army without a hero - 52 Titans, 350 Archmages, and so on.
I will have to use a tried and tested method - hire foreign mercenaries. After all, I have 3 Necropolises, 1 Knight Castle, and 1 native Castle. In addition, there are countless neutrals on the map to level up Deidra and the knight. Only a script that greatly increases the size of the garrison can save the enemy. If there is no such script, capturing the city is only a matter of time.