Liberation Day: Stories by George Saunders:
Lauren is Major Marcus Reno, ordered by Custer to take his battalion and attack the village at its south end. Custer has promised to support him in this. Reno would prefer to stay with the main group. He has never been in a proper Indian fight. But off he rides. When the village comes into sight, the battalion breaks into a gallop. The men whoop. Soon they will be covered in glory. In the distance: white shapes, fragile structures, containing human beings. The aim is to fire into the tents, ride over them, cause a panic, chase down and kill any who flee on foot.
But now a dozen or so Hunkpapas appear, riding back and forth in the path of the advance, raising dust in an attempt to gain the women and children time to escape.