These campaigns--of which the one by General Harney against the Sioux ending in the affair of Ash Hollow on September 3, 1855, is the most cruel example--sometimes ended not in pacification but in massacre in which the ferocity of the white man vied with that of the Indian. Harney had been recalled from Europe and sent into the West against the Indians for no other purpose than that of terrifying them.[8] Such affairs as this were most unworthy of the American soldier. Nor did the Indian soon forget these atrocities: thereafter he seldom let an opportunity pass which offered revenge. The military expeditions referred to were frequently followed by the making of treaties providing for land cessions and the consequent westward recession of the Indians. Moreover, these treaties, the making of which was stoutly resisted, were usually acknowledged only by a tribal remnant; and so they were not deemed as binding by the widely scattered major portion of the tribe. Their provisions were not always observed, and often blood had to flow to secure a temporary obedience. Thus the story of the government’s relations with the Sioux became an alternation of treaties and Indian and white retaliatory measures. A treaty was only too often accepted by the Indians as a challenge for some shrewdly devised scheme of vengeful retaliation. Through a series of treaties extending from 1825 to 1851 the Indian occupants of Iowa soil were slowly but surely dispossessed. They felt the westward push of white migration, and were fearful of being unable to stem it. Unluckily for themselves they fell to intertribal quarreling, and for the moment, being off their guard, they accepted white mediation. Thus, the two treaties of Prairie du Chien had attempted to settle the differences between the Sioux and their traditional enemies, the confederated Sacs and Foxes.[9] But they did not succeed, since the line established in the first of these two treaties was so indefinite that neither white man nor Indian could locate it to his own satisfaction. To the Sioux their claim to northern and western Iowa seemed assured, and they proceeded confidently to its occupation. The Sacs and Foxes believed the same concerning their rights in southeastern Iowa and jealously sought to exclude all others from it. By the second treaty of Prairie du Chien there was established the Neutral Ground, which only aggravated the difficulties already existing.[10] Then, by the treaty of September 15, 1832, the eastern portion of the Neutral Ground was designated as a reservation for the Winnebagoes.[11] The Wahpekuta Sioux never forgot this action, which they regarded as a violation of their proprietary rights in the district; and from that time on they became increasingly more difficult to deal with and more restive of restraint. Later the Winnebagoes by two successive treaties made an absolute cession of this land.[12] It was then opened to settlement, and the Sioux sulkily retired westward.