Bane and Deathstroke are being paid to eliminate the Bat Family.
They have three months prep and all of their combined resources. The Bat Family, consisting of Batman, Batwoman, Drake, Grayson, and Damien, does not know that they are coming.
For the sake of the scenario, the family can receive no help or aid from outside of Gotham.
Beyond that, Gotham functions as always with the people who live inside of it. Does the family manage to turn the tables on their hunters?