Surround them and keep up the noise. If they bring in horses. Form a wall of people point back the way they arrived. Horses don't like humans. Horses, even trained horses will not advance against a wall of people and if those people are pointing for them to leave - Horses Will Leave.
Getting deeper into the mess but they are just flying across the land and dropping bombs also with rockets all of which are busting the rolling mess with more derby swirling into the void created.