Another evidence of Indian visitation was evinced by a network of trails. One of these followed the Yellowstone Valley across the Park from north to south. It divided at Yellowstone Lake, the principal branch adhering to the east shore and leading to Two Ocean Pass where it intersected the great Snake and Wind River trail. Since Indian trails multisected the Yellowstone area it is obvious that the region was a sort of no-man’s land. Undesirable as a homeland, it was used as a summer retreat by many Rocky Mountain tribes. From this circumstance it may be assumed that an autumn seldom passed without a clash between the Bannocks and the Crows or the Shoshonis. Surely, the shrill notes of Blackfeet warwhoops have echoed in these vales. Campsites were well chosen both from the viewpoint of preserving secrecy and desirability as watchtower sites. The most important trail, however, was that known as the Great Bannock Trail. The Bannocks of southeastern Idaho made an annual trek to the Bighorn Basin for buffalo. Their trail followed Henrys Fork of Snake River to Henrys Lake, an ancient Bannock rendezvous. From this notable camp the trail went up Howard Creek and crossed the Continental Divide at Targhee Pass. Upon reaching the Upper Madison Valley, the route passed Horse Butte and angled north of West Yellowstone townsite. A camp at Great Springs (now Cory Springs) was situated near the Park boundary. In Yellowstone National Park, the Bannock Trail winds its devious way across the northern part. There are a half-dozen deviations from the main artery. Wayne Replogle suggests that weather conditions determined these alternations. High ground would be chosen enroute to the plains, but the return trip could be made along the streams. Other considerations might include security, grazing, and game. Entering the Park upon Duck Creek the Trail swung northward across Campanula Creek, paralleled Gneiss Creek to the point of crossing, then quartered southward, crossing Maple Creek and Duck Creek, on toward the head of Cougar Creek and its ample pasture lands. From this area the Trail goes almost due north to White Peaks, which are skirted on the West. The Gallatin Range was crossed via a saddle north of White Peaks. The Trail then dropped upon the headwaters of Indian Creek and followed down to Gardner River. The route then looped to the left, across Swan Lake flats, on through Snow Pass, down the decline to Mammoth Hot Springs. From Mammoth the Indian thoroughfare struck right, recrossed Gardner River, and followed Lava Creek toward Tower Fall.