When in 1738 the intrepid French-Canadian, Pierre Verendrye, his three sons, and his nephew set out on foot to trudge weary miles across the prairies to the Mantannes on the Missouri River, they did not dream that some day man-made birds would flash their silver wings against the sky and glide smoothly to rest on the level plains. Less than 200 years were to pass before this miracle of transportation progress would become so commonplace that a native North Dakotan would think nothing of a trip from Montreal to Bismarck by plane, but would be astonished at the thought of anyone's walking that distance. Verendrye, the first white man known to have touched North Dakota soil, and other explorers who followed in those early years, came on foot to visit the Indians. They found the Mandans, who lived beside the Missouri, in possession of unusual means of water transportation. The dugout canoe, made of a log, was found on all the rivers of North Dakota, but only in the Missouri Valley did the Indians use the bullboat, a circular craft of the coracle type which the Indians made by stretching a buffalo hide over a willow frame. Before the introduction of the horse, Indians used the dog train for hauling heavy loads overland, but when the Sioux migrated into this territory from the south and east they brought the horse with them. Of all tribes the Sioux were the most graceful and daring riders. The horse travois, a rather crude means of hauling baggage devised by the Indians, soon gave way to the white man's wagon as settlers began to pour in. The covered wagon served to move the immigrant family to its new home, and furnished immediate living quarters. In the Red River country before 1820, the oxcart, made entirely of wood with cross sections of a round log for wheels, was introduced at Pembina. Long creaking trains of these carts drawn by oxen made their way slowly across the country carrying settlers and supplies. Before the coming of modern means of transportation, the Missouri River formed the most important avenue of entry into what is now North Dakota. The ascent of the river by the steamboat _Yellowstone_ to Fort Union in 1832 was an event of importance, because the Big Muddy had never before been navigated through this territory. The Indians who witnessed the coming of this first boat found great significance in it also. According to George Catlin, the artist, who was aboard the steamer, some of them shot their dogs and horses in a sacrifice to appease the Great Spirit, whom they thought to be offended; some ran frightened to their homes; and some among the Mandans cautiously approached the ship, "the big medicine canoe with eyes", which in some mysterious way could see its own way to take the deep water in the middle of the channel.