First, our own military is not likely to take on their own citizenry, unless they are as subverted and blind as the BATF anf FBI were at Waco (which unfortunately does show it can happen.) Second, those of us who are armed and have some training would be very tough to take down on our home turf. We know the land (neighborhoods, city, surrounding area) and even with handguns would pick off our share of the "invaders."
Even at my age I can hit out to a reasonable distance with a handgun from a rest. I do even better with a rifle. The opponents of freedom don't want to take me (and my many gun-toting friends) on in a house-to-house fight on my turf. As Mel Gibson said in the "Patriot" - "aim small, miss small." There would be many one-shot kills.