 Complete the following phrase:  During Harrisons administration, the Lakota Sioux, previously confined to reservations in South Dakota, grew restive under the influence of Wovoka, a medicine man, who encouraged them to participate in a spiritual movement called the Ghost Dance. Many in Washington did not understand the predomitly religious nature of the Ghost Dance, and thought it was a militant movement being used to rally Native Americans against the government. In reality, however, there were only about 4,200 ghost dancers, most of whom were women, children, and the elderly. In November of 1890, Harrison himself ordered troops to Pine Ridge in order to prevent any outbreak that may put in peril the lives and homes of the settlers of the adjacent states. The arrival of troops increased tensions on both sides, and the natives felt threatened. On December 29, 1890, troops from the Seventh Cavalry clashed with the Sioux at 