A Congregation of Jackals(2010)

S. Craig Zahler

One of Oswell's old bank-robbing gang is getting married out in Montana Territory, and the rest of the boys are all invited. But someone else will be there too. Quinlan. He was part of the gang once, but betrayal turned an ally into a bitter enemy,  one who will stop at nothing to get his revenge. He and his gunmen will be at the wedding out for blood and to revenge the betrayal in a final showdown. Oswell knows there's no way out of it. You can't outrun your past. All you can do is face it-- and hope to survive.