Albert H. Campbell, General Superintendent of the Pacific Wagon Roads, wrote in 1859 that the Shoshone were restricted to the area west of the Rockies (1859, p. 8):
The Snakes have received very little attention hitherto from the authorities of the United States, and frequent wars with their powerful neighbors, the Blackfeet and Crows, have compelled them in a manner to withdraw from the buffalo range and keep within the mountain fastnesses, where they derive a scanty subsistence from roots and the smaller game.
The total context of historical material indicates, however, that the Shoshone were hunting buffalo on the eastern side of the Continental Divide during this period and, in so doing, were following a pattern of transmontane hunting familiar to us among the Plateau tribes. Forney wrote in September, 1858 (1859, p. 564):
I have heretofore spoken of a large tribe of Indians known as the Snakes. They claim a large tract of country lying in the eastern part of this Territory, but are scarcely ever found upon their own land.
They generally inhabit the Wind River country, in Oregon and Nebraska Territories, and they sometimes range as far east as Fort Laramie, in the latter Territory. Their principal subsistence is the buffalo, and it is for the purpose of hunting them that they range so far east of their own country. This tribe numbers about twelve hundred souls, all under one principal chief, Wash-a-kee. He has perfect command over them, and is one of the finest looking and most intellectual Indians I ever saw.
The duration of the previously mentioned peaceful interlude between the Crow and the Shoshone of Wyoming cannot be accurately determined. However, Lander reported them at war in 1858 (1859, p. 49):
The Crow and Shoshonee Indians having broken out into open war in the north, did not permit of my risking or exposing the large stock of mules of the expedition at the camp selected as the wintering ground of last year's expedition, on Wind River.
Lander encountered Washakie and "the whole of the great tribe of the eastern Shoshonees" hunting antelope on the headwaters of the Green River (p. 68). The Shoshone spent the winter on Wind River but "the last account from them say they are in a starving condition; they are at war with the Crows, and are afraid to go out to hunt for game" (p. 69). The Shoshone had fought with the Crow on October 27, 1858, which had probably prevented them from attempting the fall buffalo hunt. They apparently undertook a hunt during the following spring, for Will H. Wagner, an engineer on the South Pass wagon road, observed in May of 1859 that only a few Shoshone lodges were found on Green River, the main body still being in the Wind River Valley (Wagner, 1861, p. 25).
In February, 1860, Lander wrote a summary of Eastern Shoshone territorial use as of 1859 (1860, pp. 121-122):
The Eastern Snakes range from the waters of Wind river or latitude 43° 30' on the north and from the South Pass to the headwaters of the North Platte on the east, and to Bear river near the mouth of Smith's Fork on the west. They extend south as far as Brown's Hole on Green River. Their principal subsistence is the roots and seeds of the wild vegetables of the region they inhabit, the mountain trout, with which all the streams of the country are abundantly supplied, and wild game. The latter is now very scarce in the vicinity of the new and old emigrant roads.
The immense herds of antelope I remember having seen along the route of the new road in 1854 and 1857 seem to have disappeared. These Indians visit the border ground between their own country and the Crows and Blackfeet for the purpose of hunting Elk, Antelope and stray herds of buffalo. When these trips are made they travel only in large bands for fear of the Blackfeet and Crows. With the Bannacks and parties of Salt Lake Diggers they often make still longer marches into the northwestern buffalo ranges on the head waters of the Missouri and Yellow Stone.
These excursions usually last over winter, the more western Indians who join them passing over a distance of twelve hundred miles on the out and return journey.
Under the leadership of Washakie, which dates from approximately the beginning of the period of heavy emigration to the Far West, the Shoshone of Wyoming had maintained amicable relations with the whites. The early 1860's, however, saw increased clashes between Indians and whites in the Bear River country and in southern Idaho. While the activities of Chief Pocatello's band and of other hostile groups will be further discussed in the section on Idaho, it would be well at this point to clarify relations between Washakie's followers and the people of Bear River. It is impossible to differentiate a Wyoming group as distinct from the Shoshone of Bear River in earlier periods, and, in view of the presence of buffalo in the country of the Green and Bear rivers until at least 1840, it is more than probable that southwestern Wyoming, northern Utah, and southeastern Idaho were common grounds roamed over by several nomadic hunting groups. Lander recognized the affinity between the areas, although he distinguished Washakie's Eastern Shoshone from the Utah residents on the basis of their respective relations with the whites (Lander, 1860, pp. 122-123):