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Well, this seems to be a micro-guide for the final battle, as I understand it.
However, one thing is unclear: on the first turn, the Destroyer won't be able to reach the enemy unless it gets a morale boost. If we try to speed it up with spells (and we should only use +50% speed – 2 movement points from the same Heroic Advance won't be enough), we won't be able to inflict petrification on the same turn. Destroyers die quickly, especially on the first turn, and without any alternatives, most of the enemy stacks will be attacking them.
And another point is unclear. What prevents the Alliance from using the same tactic if they have Sun Crusaders?