The riot squad defending the embattled entrance to the west side of the U.S. Capitol was surrounded by violence. Rioters had clambered up the scaffolding by the stage erected for the inauguration of President Joseph Biden. They hurled everything they could get their hands on at the cops beneath: rebar, plywood, power tools, even cans of food they had frozen for extra damage.

In front of the cops, a mob was mounting a frontal assault. Its members hit officers with fists and baseball bats. They grabbed at weapons slung from the officers’ waists. They unleashed a barrage of M-80 firecrackers. Soaked in never-ending streams of bright orange bear spray, the officers choked on plumes of acrid smoke that singed their nostrils and obscured their vision.

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