As has been said before, no one is going to order any military unit to take weapons or arrest any lawful, peaceful American; no one. If they did, I have no doubt upper ranking officers would revolt and refuse such orders and many lower ranking members would also refuse.
What they will do is create a bogus situation and ask the military to quell it.
They know that no military member will ever disobey an order they think might not be right unless they were 100% sure they could refuse it without consequences and they were right.
If you are a veteran then you know very well the training is “Follow orders! We don’t pay you to think!” Some officer may revolt out of personal convictions, but they can easily be replaced. The vast majority of grunts will do as they are told and all they need is a simple plausible excuse to do so. There are NO grunts asking questions about legalities or civil rights or constitutional authorities. Not at first. Every single one of them will snap to and yell, “Yes, Sir!” in English or Spanish, who knows.
Now, a few days or weeks later, that dynamic will change radically. Troops will start questioning their orders, but not at first. At first they will be in yes sir mode and the shock of their orders won’t set in until they see the results. If they are shot at by Americans, they will be told those are “terrorists” or “agitators” or “rebels” that are causing the problems. Not being allowed to make phone calls or watch TV or read a newspaper, most will be clueless and follow whatever orders the propaganda suggests they should. Government propaganda and threats are powerful influences.
I have no doubt the People can win against the federal government. Hell, they number at most 4 million, including all LEO and FLEO. Against not less than 15 million well armed, trained, and military experienced Americans who no longer are funding the federal government, there is no way in Hell they can win.
Your first sentence is ridicules since no one suggested the military is going to attack or mass arrest any *peaceful* Americans. That would certainly not be tolerated either.
If things get really bad, and the mood of the people changes from simple anger to boiling contempt, I hope no authority ever decides to go up against the people of this country. It will be government that needs to dramatically change and restructure, not the people.
In an extreme scenario, it would make the dusty streets of Baghdad look like a church picnic on a spring day.
The military would have better luck using teaspoons to stop rain from striking the ground.
If this comes to pass, and I really hope it does not, in the end it must be the people and the Constitution that prevail, not the government that has created and perpetuated these disasters.