Presumably I would be taking over a city for my own reward/ selfish reasons and not to improve governance for the local nationals.
In that case I would choose snakes as the propaganda I could generate with those bad boys would amplify my power and hold over the city, snakes are hard to pin down and can terrify in buildings. (Snakes on a plane?)
My plan would be to split them up into teams of thirty. I would send one team be to shut down the mobile networks and another to the power grid. I would then send roadblock teams to get in position to isolate the central district and send in hit teams to fix the police and the mayors office and get him to handover power to me. All the first teams would be on stand by if he didn't transition power, however, my first team would be sent to the mayors house to hold his family hostage if he tried any funny business.