Lonesome Dove, Volume 2: Comanche Moon by Larry McMurtry

IDAHI HAD RIDDEN all the way from the Big Wichita to the Arkansas River, looking for Blue Duck and his band of renegades; he wanted to join the band and become a renegade himself, mainly so he could go on killing white people and stealing their guns. Idahi would kill anybody, Indian or white, if they had guns that he wanted to shoot. He didn't consider himself a harsh or a particularly bloodthirsty man-it was merely that killing people was usually the easiest way to get their guns.

To his annoyance Idahi missed Blue Duck as he was traveling toward the Arkansas. Several people had told him Blue Duck was camped on the Arkansas, when in fact he was camped on a sandy bend of the Red River, well east, where the river curved into the forests.