A handful of Jews with few weapons held off the Nazis outside the Warsaw Ghetto for a number of days.
Thugs & fascists are cowards when faced with armed opposition. They’re more used to bullying and thuggery, not conflict or battle.
When some trained (former) Marines and Soldiers start to organize, these thugs will melt back into their neighborhoods like the cowards they are. Sure they'll be a few to go out in a blaze of glory, but the ones that get to watch that won't want some of that.