How to conquer Kuttenberg in Kingdom Come: Deliverance 2

Using Steam user Triget's "Companion Squad" mod, a PC Gamer writer raised a 43-strong army in Kingdom Come: Deliverance 2 and stormed Kuttenberg. Because the army was set to "Bandit mode," the coup turned into a massacre that cleared the city's guards in under 20 minutes, at the cost of seven soldiers, Hans and Zizka, and a badly broken save.