On the morning of January 6, a gallows was erected on the National Mall in Washington, D.C. A little after noon, as thousands of Trump supporters marched past the structure, some paused to climb its wooden steps and take pictures of the US Capitol framed within an oval noose. Up ahead, the dull thud of stun grenades could be heard, accompanied by bright flashes. Several people carried Confederate flags. Others had Tasers, baseball bats, bear spray, and truncheons. 'They need help!' a man shouted. 'It's us versus the cops!' No one seemed surprised by what was taking place. There was an eerie sense of inexorability, mixed with nervous hesitation. It reminded me of combat: the slightly shocked, almost bashful moment when bravado, fantasy, and training crash against reality.