Mormon History, Apr 18, 1847. Sunday.

[William Clayton Journal] This morning I wrote a letter for Heber to his wife Vilate which was sent by Brother Ellis Eames who has concluded to go back on account of poor health, spitting blood &c. He started back with the traders wagon about eight o'clock A.M. The wind this morning E. and S.E. and very cold, with a slight shower of snow. At 10 A.M. 7 more traders wagons came in and stopped about 1/4 of a mile below us, soon after 6 mules loaded with robes and furs. These traders say they have come from the Pawnee village in two days. Brother Roundy got some Buffalo meat from them and give me a little, which I thought tasted very good. I commenced writing Hebers journal and wrote considerable. He wants me to write his journal all the journey. I also wrote considerable in this book. P.M. the weather more moderate and pleasant, the wind has changed near South and the sun shines . . .
At 5 o'clock, the officers of the camp met with President Young, and he told the order for travelling and camping hereafter, which was communicated to the companies by the Captains of 10's as follows.
At 5:00 in the morning the bugle is to be sounded as a signal for every man to arise and attend prayers before he leaves his wagon. Then cooking, eating, feeding teams &c. till 7 o'clock at which time the Camp is to move at the sound of the bugle. Each teamster to keep beside his team, with their loaded gun in their hands or in their wagon where they can get them in a moment. The extra men, each to walk opposite his wagon with his loaded gun on his shoulder, and no man to be permitted to leave his wagon unless he obtains permission from his officer. In case of an attack from Indians or hostile appearances the wagons to travel in double file. The order of encampment to be in a circle with the mouth of the wagon to the outside, and the horses and stock tied inside the circle. At 8 1/2 P.M. the bugles to be sounded again at which time all to have prayers in their wagons and to retire to rest by 9 o'clock. Tonight I went to bed about 7 1/2 o'clock suffering severely with pain in my head and face. I slept with Philo Johnson.

[George D. Smith, An Intimate Chronicle; The Journals of William Clayton, Signature Books in association with Smith Research Associates, Salt Lake City, 1995, http://amzn.to/william-clayton]