This actually happened once in Western Md. a few years after the drug war got started and "no-knock" raids were just getting started, several dead fibbies and state cops, and a jury took less than half an hour to find the defendant innocent on all charges and, near as I can tell, that had the effect of shutting down no-knock raids for some time afterwards. That was well before the internet age however and I've not been able to find any reference to the story on the net in recent years.
There was a case in Minneapolis a decade or so back where an immigrant (Hmong) family was invaded in a wrong address scenario. The father fought back with a shotgun, and the SWAT team backed off. No one died or was wounded, and the family ended up with a substantial six figure settlement.
http://www.foxnews.com/story/0,2933,317398,00.html
What happens when you shoot the SWAT guy coming in the door in the night? Ask Ryan Frederick what happened when he used his .380 to shoot the intruder Detective Jarrod Shivers who blew a hole in his door and was reaching in to unlock it. Yep 10 years for voluntary manslaughter.