Weasel Zippers has a story from St. Louis where a husband and wife observed a couple of gunmen holding a gun to their daughter’s head. While the gunmen were walking the daughter up to the house, the husband and wife retrieved their own guns. When the gunmen entered the house, the couple opened fire, killing one and wounding the other. Both men had extensive criminal records. The St. Louis Post Dispatch has the details.
Another classic case of where armed homeowners were the first and last line of defense. There would have been no time to call 911 and expect help to arrive in time. It was kill or be killed and the homeowners took the proper course of action. Of course, since one of the gunmen survived, that means the homeowners need a bit more range time.