I was fully aware that the same accident which had brought me to the ground might again occur; but of that I must run the risk.  Before, however, my horse could spring forward, the herd was close upon us. Digging my heels into his flanks, I urged him on, shrieking at the top of my voice.  The sound of the tramping hoofs behind him, the bellowing of the bulls, and the expectation every instant of being probed by their horns, made him strain every muscle to keep ahead of them.  His speed was far greater than theirs, and he soon distanced them; but still, the danger of again falling was imminent, for as we flew along I could see in every direction the burrows of those abominable little prairie dogs, though the inhabitants had taken good care to ensconce themselves far down out of the way of the hoofs of the buffalo.  Looking over my shoulder, I saw that by turning to the right I might soon get clear of the herd, which did not extend far on that side.  I accordingly pulled the right rein, so as to ride almost across the course the herd was taking; and observed, as I did so, a number of the Indians galloping along by the side of the buffalo, and shooting their arrows.