On Nov. 28, a legal collective representing Native Americans opposing the construction of the Dakota Access Pipeline filed a lawsuit against two North Dakota counties and their sheriffs, and the city of Mandan, North Dakota, and its police chief. Eight days before, the suit alleges, law enforcement officers from those places had used excessive force against a group of peaceful protesters, injuring more than 200.The allegations in the case are striking — the lawsuit describes officers using water cannons on protesters despite freezing temperatures, shooting people in the head with non-lethal plastic rounds, and shooting a woman in the genitals with a flash-bang grenade.