Henry H. Sibley, Appletons' Cyclopædia of American Biography (1892)
“ Suddenly and unexpectedly the savages, with a few exceptions, rose in a body, on 18 Aug., 1862, murdered their traders and the other whites at the two U. S. agencies, and then spread themselves in small parties along a line of frontier more than two hundred miles in extent, butchering the unsuspecting men, women, and children without mercy. ”
