After signing the 1864 treaty, members were forcibly placed upon the "Klamath Indian Reservation." At the time there was tension between the Klamath and the Modoc. A band of Modoc left the reservation to return to Northern California. The U.S. Army defeated them in the Modoc War (1872–73), and forcibly returned them to Oregon. The Klamath Indian agency actually included three tribes: the Klamath, Modoc, and the Yahooskin Band of Northern Paiute Indians. In 1874, Oregon's legislature created Lake County, Oregon, which included the reservation lands (and from which Klamath County, Oregon was later separated).