The leader notifies the young men who are going with him on what day and at what hour he intends to start. He determines the time for himself, but does not let the whole camp know it in advance. Of late years, large war parties have not been desirable. They have preferred to go out in small bodies. Just before a war party sets out, its members get together and sing the “peeling a stick song,” which is a wolf song. Then they build a sweat lodge and go into it, and with them goes in an old man, a medicine-pipe man, who has been a good warrior. They fill the pipe and ask him to pray for them, that they may have good luck, and may accomplish what they desire. The medicine-pipe man prays and sings and pours water on the hot stones, and the warriors with their knives slice bits of skin and flesh from their bodies,—their arms and breasts and sometimes from the tip of the tongue,—which they offer to the Sun. Then, after the ceremony is over, all dripping with perspiration from their vapor bath, the men go down to the river and plunge in.
In starting out, a war party often marches in the daytime, but sometimes they travel at night from the beginning. Often they may make an all night march across a wide prairie, in passing over which they might be seen if they travelled in the day. They journey on foot, always. The older men carry their arms, while the boys bear the moccasins, the ropes, and the food, which usually consists of dried meat or pemmican. They carry also coats and blankets and their war bonnets and otter skin medicine. The leader has but little physical labor to perform. His mind is occupied in planning the movements of his party. He is treated with the greatest respect. The others mend his moccasins, and give him the best of the food which they carry.
After they get away from the main camp, the leader selects the strongest of the young men, and sends him ahead to some designated butte, saying, “Go to that place, and look carefully over the country, and if you see nothing, make signals to us to come on.” This scout goes on ahead, travelling in the ravines and coulees, and keeps himself well hidden. After he has reconnoitred and made signs that he sees nothing, the party proceeds straight toward him.
The party usually starts early in the morning and travels all day, making camp at sundown. During the day, if they happen to come upon an antelope or a buffalo, they kill it, if possible, and take some of the meat with them. They try in every way to economize their pemmican. They always endeavor to make camp in the thick timber, where they cannot be seen; and here, when it is necessary, on account of bad weather or for other reasons, they build a war lodge. Taking four young cotton-woods or aspens, on which the leaves are left, and lashing them together like lodge poles, but with the butts up, about these they place other similar trees, also butts up and untrimmed. The leaves keep the rain off, and prevent the light of the fire which is built in the lodge from showing through. Sometimes, when on the prairie, where there is no wood, in stormy weather they will build a shelter of rocks. When the party has come close to the enemy, or into a country where the enemy are likely to be found, they build no more fires, but eat their food uncooked.