This diary is Spencer's account of the trek from Nauvoo to Winter Quarters, Nebraska, from March to December 1846. The diary from 11 July to October is not a daily record, but rather a narrative of events observed by the author. The diary is an important record of the Mormon Exodus from Nauvoo, across Iowa to Winter Quarters on the Missouri River. It includes details on the beginnings of Garden Grove, including the Mormon cemetery there. It provides details on the trek across Iowa and the comings and goings of various Mormon pioneers from Nauvoo. It also provides details on the food and supplies issues of the trek, illnesses and deaths on the trail, meetings and/or conversations with Brigham Young, Indian relations, brief information on the problematic Emmett Company, call of the Mormon Battalion, and beginnings of the Mormon settlement at Winter Quarters.