Shoot the first one with a gun nearest to you. If the other keep coming, shoot the loudest or closest. In Georgia I do not have to retreat in public and not in my house. After the first shots are fired, you will see some scattering of folks. If they arrived in a car, disable it, cut tires or shoot tires. Get on your cell phone and start dialing 911 and hope you do not get put on hold like some folks in Atlanta, Ga do. Get off the X first and go to Defensive mode. Get training for these issues, there are lots of schools that can train you on how to survive. These issues are only going to get worse as the economy fails and the BG's come out of the shadows.