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In a battle with Godric, Markel and I were greatly assisted by a phoenix. It took out 5 titans with a single strike. I didn't summon any elementals at all.
I completed the mission with the curses on the hero without any problems. However, when I first played as a Barbarian, a wizard appeared with about 100 titans and defeated me. I passed it on the second attempt. I didn't encounter any glitches in any of the original missions or both expansions. The only glitch I encountered was in the bonus mission "Dark Mission" - one key artifact was located on top of a mountain. I managed without it.
It took me a few tries to complete the mission with 7 castles for Raileg in version 1.5. I didn't know that in this version, the second enemy attacks the castle at night earlier than Raileg's mana is restored.