"We surround the place. We drench it in tear gas and light it on fire in as many spots as possible. You have snipers all over the place ready to nail anyone who comes out. We don't care about taking them alive, we shoot to kill every time. Then, when they are all dead or dying, we move in and see if we can capture anyone, but first we knee cap them. It's brutal and probably illegal, but it is the best plan with what we have. Unless if you are willing to have me unleash nerve gas in the city, which even I think is stupid.
Another option is I disappear and start taking them out one by one, day by day. I would have zero contact with you, and some civilians would die.
Or we could contact a different big gang and try to solicit their help, but then you're tossing in with criminals.
Those are our best options. Or I could just leave if you prefer."