The Nez Perce War was an armed conflict between several bands of the Nez Perce tribe of Native Americans and their allies, a small band of the Palouse tribe led by Red Echo (Hahtalekin) and Bald Head (Husishusis Kute), against the United States Army. The conflict, fought between June–October 1877, stemmed from the refusal of several bands of the Nez Perce, dubbed "non-treaty Indians", to give up their ancestral lands in the Pacific Northwest and move to an Indian reservation in Idaho. This forced removal was in violation of the 1855 Treaty of Walla Walla, which granted the tribe 7.5 million acres in their ancestral lands and the right to hunt and fish in lands ceded to the government.