Those mounted Native Americans in the original post are great!
Just a couple of weeks ago I was reading an account of the Battle of Little Big Horn from the Indian perspective. Let's see if I can find it and quote a bit.
Here is some from http://www.smithsonianmag.com/history-archaeology/How-the-Battle-of-Little-Bighorn-Was-Won.html?c=y&page=5
Flying Hawk said he had followed Crazy Horse down the river past the center of camp. 'We came to a ravine',¯ Flying Hawk later recalled, 'then we followed up the gulch to a place in the rear of the soldiers that were making the stand on the hill.' From his half-protected vantage at the head of the ravine, Flying Hawk said, Crazy Horse shot them as fast as he could load his gun.¯
This was one style of Sioux fighting. Another was the brave run. Typically the change from one to the other was preceded by no long discussion; a warrior simply perceived that the moment was right. He might shout: 'I am going!' Or he might yell 'Hokahey!' or give the war trill or clench an eagle bone whistle between his teeth and blow the piercing scree sound. Red Feather said Crazy Horse's moment came when the two sides were keeping low and popping up to shoot at each other, a standoff moment.
'There was a great deal of noise and confusion',¯ said Waterman, an Arapaho warrior. The air was heavy with powder smoke, and the Indians were all yelling. 'Out of this chaos', said Red Feather, 'Crazy Horse came up on horseback¯ blowing his eagle bone whistle and riding between the length of the two lines of fighters. Crazy Horse...was the bravest man I ever saw', said Waterman. He rode closest to the soldiers, yelling to his warriors. All the soldiers were shooting at him but he was never hit.¯
After firing their rifles at Crazy Horse, the soldiers had to reload. It was then that the Indians rose up and charged. Among the soldiers, panic ensued; those gathered around Calhoun Hill were suddenly cut off from those stretching along the backbone toward Custer Hill, leaving each bunch vulnerable to the Indians charging them on foot and horseback.