Honestly.. I don't know what a bunch of guys, half-retired with their 30-06 rifles and 12 gauge shotguns are going to do against 100 million ChiComs.
100 million? There can't be that many. At most a few millions. Unless you invent something like 'Star Gate.' :-) Besides, defenders have home field advantage. They know the terrain, and the environment in general. Cut their supply line, and the war of attrition would take care of it. If they are in America, they would really have the resupply problem.