Saleen said to Marquis Carloranna, "I'll take care of Pompeii City. You won't have to bear much of the brunt from the assault. You can use the materials I provide to build new armies, which can be trained when attacking Pompeii. The true battlefield should happen between us and the Holy See."
"Your Highness, you've brought less than 2000 with you!" While Marquis Carloranna was very impressed with Saleen's powers, he still deemed it to be too straining for Saleen to take on the Grand Duke personally. From his perspective, the power of one person was always limited.
"No, I brought 100,000 with me and there are hundreds of level nine ones among them. The Grand Duke's Pompeii's estate is not a true duchy, so he can't have amassed too large of an army. Take down Pompeii City and it'd be the end of everything. I'll leave the rest to you."