In the 1960s and 1970s, Carson came under the scrutiny of revisionist historians. Hitherto he had been regarded as an American hero, but the tide turned and he became an arch-villain in the genocidal campaign against the Native Americans. Clifford Trafzer's 1982 "Kit Carson Campaign: The Last Great Navajo War" found fault with both Carleton and Carson, but Trafzer completely ignored Carson's many acts and deeds that humanized The Long Walk.