Geronimo was a prominent leader and medicine man from the Bedonkohe band of the Apache people. From 1850 to 1886, Geronimo joined with members of three other Chiricahua Apache bands—the Tchihende, the Tsokanende and the Nednhi—to carry out numerous raids, as well as fight against Mexican and U.S. military campaigns in the northern Mexico states of Chihuahua and Sonora and in the southwestern American territories of New Mexico and Arizona. Geronimo's raids and related combat actions were a part of the prolonged period of the Apache–United States conflict, which started with American settlement in Apache lands following the end of the war with Mexico in 1848.