The most manageable scenario might be if a state secedes then raises its own militias for defence with the states significant command and control structure in place. It may first have to capture local pockets of insurgency.

Urban combat is a potential nightmare. Any force can end up entangled even an experienced one. The collateral is a real problem I pointed out earlier. You can end up also inflicting stuff on your people. There might be ways around that but it's not necessarily easy. A huge amount depends on the lay of the land.

Hit and runs they might not be able to so easily stop you. It may be more difficult to do that with marshal law.

If it reaches the point of extremes though there are targets you can hit to inflict maximum damage. To a fair degree the Pentagon already has all of these listed though total coverage can be difficult. Some avenues of attack may be very difficult to avoid.

A city isn't going to be captured by a small force. It would take a substantial militia to achieve that. It's a difficult prospect but if pulled off you have a very nasty hostage situation on your hand. It means being prepared to be besieged though including things like night vision because they'll cut the power. Also making booby traps, etc.

The most manageable scenario might be if a state secedes then raises its own militias for defence with the states significant command and control structure in place. It may first have to capture local pockets of insurgency.

Urban combat is a potential nightmare. Any force can end up entangled even an experienced one. The collateral is a real problem I pointed out earlier. You can end up also inflicting stuff on your people. There might be ways around that but it's not necessarily easy. A huge amount depends on the lay of the land.

Hit and runs they might not be able to so easily stop you. It may be more difficult to do that with marshal law.

If it reaches the point of extremes though there are targets you can hit to inflict maximum damage. To a fair degree the Pentagon already has all of these listed though total coverage can be difficult. Some avenues of attack may be very difficult to avoid.

A city isn't going to be captured by a small force. It would take a substantial militia to achieve that.