I don't know if you watch FTWD, but one guy took out an entire settlement of people by leading a huge hoard of walkers to them.I like the whole using walkers as a weapon thing. They should do that more often. I'd load a 53' trailer full of them, drive real slow with music blaring to attract several thousand more, then run through the gate and side of the wall at Negan's place. I'd have my folks surrounding the place to pick off Negan's guys as they tried to run. I'd come back in a couple of days with several cars and have them honking horns and doing donuts to draw the walkers back out, then I'd go in and take whatever I wanted.
He would fire a grenade launcher every once in awhile to keep them moving in the direction he wanted them to.
They overran the whole place and everybody had to get the hell outta Dodge.