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Crook had made a previous attempt in March to corner the Lakota. When his force got within a hundred miles of the Yellowstone River,
Reynolds discovered a village of Cheyenne which was in use as a staging area, containing 800-1500 ponies as well as large stores of guns, ammunition, food and other supplies.
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For failing to follow through on the initial attack with his full detachment, and for destroying rather than holding the Cheyenne supplies, Reynolds was later court-martialed.
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At 8 a.m., Crook stopped to rest his men and animals. Although deep in hostile territory, Crook made no special dispositions for defense. His troops halted in their marching order. The Crow and Shoshone scouts remained alert while the soldiers rested. Soldiers in camp began to hear gunfire coming from the bluffs to the north, where the scouts were positioned. As the intensity of fire increased, a scout rushed into the camp shouting, "Lakota, Lakota!" By 8:30 am, the Sioux and Cheyenne had hotly engaged Crook's Indian allies on the high ground north of the main body. Heavily outnumbered, the Crow and Shoshone scouts fell back toward the camp, but their fighting withdrawal gave Crook time to deploy his forces.
Crook directed his forces to seize the high ground north and south of the Rosebud Creek. He ordered Captain Van Vliet
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To accelerate the advance, Crook ordered Captain Anson Mills,
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At the west end of the field, Lieutenant Colonel William Royall, Crook's second in command, pursued the Indians' attacking the rear of Crook's camp. Leading Captain Henry's three troops of the 3d Cavalry and two troops borrowed from Mills' command, Royall advanced rapidly along the ridgeline to the northwest, finally halting his advance near the head of Kollmar Creek.
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Crook's initial charges secured key terrain but did little to damage the Indian forces.
Crook returned to his battle plan. Believing the Sioux and Cheyennes' fighting tenacity was based on defense of families in a nearby village, Crook ordered Mills and Noyes to withdraw their cavalry from the high ground and follow the Rosebud north to find the suspected village. He recalled Van Vliet's battalion from the south side of the Rosebud.
Only 1 mile (1.6 km) away, Royall's situation was deteriorating. He tried to withdraw across Kollmar Creek but found the Indians' fire too heavy. Next he began to withdraw southeast along the ridgeline. A large group of Sioux and Cheyenne broke off from the fight against Crooks' main forces and charged boldly down the valley of Kollmar Creek, advancing all the way to the Rosebud. The arrival of Van Vliet's command checked the warriors' advance. Crook ordered the Crow and Shoshone scouts to charge into the withdrawing warriors' flank.
Mills' advance up the Rosebud left Crook without sufficient force to aid Royall and his hard-pressed battalion. While Mills made his way up the Rosebud, searching for a village that did not exist, Royall's situation grew worse.
At approximately 1130, Royall withdrew to the southeast and assumed a new defensive position. He hoped to lead his command across Kollmar Creek and rendezvous with Crook. Meanwhile, the Sioux and Cheyenne attacked him from three sides. From his headquarters, Crook realized that Royall needed help to get out of the situation, help only Mills' force could provide. Crook sent orders to Mills redirecting him to turn west and attack the rear of the Indians' pressing Royall.
At approximately 1230, Royall decided against further waiting and withdrew his troops into the Kollmar ravine to remount their horses. From there, they would have to ride through gunfire to reach the relative safety of Crook's main position. As the US cavalry began their dash, the Crow and Shoshone scouts countercharged the pursuing enemy and relieved much of the pressure on Royall's men. Two companies of infantry left the main position to provide covering fire from the northeast side of the ravine. Royall's command still suffered grievous casualties.
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Mills arrived too late to assist Royall's withdrawal, but his unexpected appearance on the Indians' flank caused the Sioux and Cheyenne to break contact and retreat. Concentrating his mounted units, Crook now led them up the Rosebud in search of the non-existent Indian village. The advance came upon a narrow ravine which the scouts warned was an excellent spot for an ambush. Crook halted his advance. The battle of Rosebud was over. By the standards of Indian warfare, it had been an extremely long and bloody engagement. Never before had the Plains Indians fought with such ferocity, and never before had they shown such a willingness to accept casualties. Nor was their sacrifice in vain. Concerned for his wounded, short on supplies, and perhaps still shaken by the Indians' ferocity, Crook returned to his camp on Goose Creek and stayed there for seven weeks awaiting reinforcements. Unlike his enemies, Crook's command would play no role in the momentous events at The Little Bighorn.
The hard fought battle lasted for six hours. Hard fighting by Crook's Indian allies during the early stages saved his command from a likely devastating surprise attack. The gallantry of the Crow and Shoshone scouts throughout the battle was crucial to Crook's averting disaster.
Crook withdrew to a position on Big Goose Creek, near present-day Sheridan, Wyoming,
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