It will be an after the fact happening. It's just a matter of practicality. You can't use arms against a government to prevent the attempt to subjugate the people; because where do you start and how do you prevent becoming the very type of monster you would be fighting against?
You can only use retained arms to fight back AFTER the government subjugates the people. As the people of disarmed Australia recently discovered with the government enforced COVID tyrannies, Letting yourself be disarmed in advance . . . is the real tragedy.