David F. Halaas Colorado State Historian, 1991–2001 David F. Halaas was the Colorado State Historian from 1991 to 2001 and is the co-author of Halfbreed: The Remarkable True Story of George Bent. David F. Halaas Written by David F. Halaas “All the Camp was Weeping” Nov 14, 2022 Scholars have long relied on George Bent’s eyewitness accounts of the Sand Creek Massacre from his position within the Cheyenne and Arapaho encampment that day to better understand how such a horrific atrocity could have happened here in Colorado.