Aside from the final crusade, this plan has three significant challenges—the first is landing, the second is establishing and protecting the Mage Tower, and the third is pushing the front line to the outskirts of Leipzig.
These three challenges become progressively simpler... by the end, expanding outward will actually be the easiest step.
The Demons' levels are greatly suppressed. Once the cluster effect is lost, they cannot defeat the elite soldiers of the Black Hawk Army. Not to mention, the Mage Tower can serve as the command center.
——The hardest part is, in fact, how to make a landing.
This is not a game, and you can't "turn off friendly fire." This means that the Elf Warship must lead in the front, or else the beam will attack allied forces—if there's a ship blocking the front of the beam, then the "Cruel Preacher" won't be able to provide cover for them.