If, God forbid, the government moves to use military force against American citizens, then we will, I believe, see a guerrilla war, fought on American soil, that will make the late unpleasantness in Vietnam look like a Sunday School picnic. What I do think will happen is that the government will use agencies like BATFE, the Marshal's Service, or some of the alphabet agencies to strike at individuals and small groups over a period of time until the majority of citizens are living in a constant state of fear.
Once that has been achieved, an "incident" will be engineered to give an excuse for the seizure of all weapons from private individuals. Think the Reichstag fire of 1933. When the confiscation starts, anyone who resists will be labelled as a terrorist, or worse. That will turn that fearful majority against those who would stand up for their rights.
I wish someone could make me believe that my predictions are totally baseless, but I've studied far too much history not to think the way I am thinking.