On September 8, 1877, the Nez Perce reached Dead Indian Pass, about six miles from Sturgis's force on the Plains below. Their advance scouts observed the soldiers far below awaiting their appearance. If the Indians took the open and easy route to reach the Plains, they would be easily visible. Instead, they attempted a difficult maneuver to mislead the soldiers. They feinted going south toward the Shoshone River by milling their horses in a big circle to kick up visible dust and sell Sturgis on the idea that they were heading south. Then, invisible to army scouts, they sneaked back north, concealed by heavy timber, and traversed Dead Indian Gulch down to the Clark's Fork River. Dead Indian Gulch was a narrow, steep-sided slit in the rock, dropping almost vertically for 1,000 feet and barely wide enough for two horses to go side-by-side. "In a cleanly executed maneuver," said a military historian, "the Nez Perce had countered an extremely serious threat and won a brilliant, though temporary respite."