An official military report (1878) based on Indian accounts uncovered the betrayal
OSCAR LONG'S REPORT
source: 2nd Lieutenant Oscar F. Long's report, 5th Infy, 1878, Greasy Grass Magazine, Vol. 11, May 1995, pages 6-9. Edited by custerwest.org's member Jeff Veach.
Report based on interviews of Indian warriors and warchiefs White Bull, Brave Wolf and Hump:
"If Reno had come his soldiers would have followed him. If Reno had joined Custer, there would have been too many soldiers for the indians, Reno & Custer together could have held the ridge,- and Custer and his command would not all have been killed.
Reno should have come down when the indians first went after Custer- followed them across, and then he (Reno) could have joined Custer, for the indians would then have been between two fires, and Custer would have been saved.
Reno could have come down the valley, and could have crossed the river, for he had but little opposition from the indians, and Custer would have seen him coming, and probably have continued on instead of falling back to the high ridge, where he was killed..."
"Custer and his men fought well- they were brave soldiers; they fired well; they did not appear frightened."