Who was one of the most important leaders of the Oglala Lakota from 1868 to 1909?

Red Cloud (1822 – December 10, 1909) was one of the most important leaders of the Oglala Lakota from 1868 to 1909. He was one of the most capable American Indian opponents that the United States Army faced in its mission to occupy the western territories, leading a successful campaign in 1866–68 known as Red Cloud's War over control of the Powder River Country in northeastern Wyoming and southern Montana. The largest action of the war was the Fetterman Fight, with 81 Army soldiers killed, and was the worst military defeat suffered by the army on the Great Plains until the Battle of the Little Bighorn ten years later.

After signing the Treaty of Fort Laramie (1868), Red Cloud led his people in the important transition to reservation life. Some of his opponents mistakenly thought of him as overall leader of the Sioux groups (Dakota, Lakota, and Nakota), but the large tribe had several major divisions and was highly decentralized. Bands among the Oglala and other divisions operated independently, even though some individual leaders were renowned as warriors and highly respected as leaders, such as Red Cloud.