The first part of the LDS Church members' migration to Utah was leaving Nauvoo in February 1846 and crossing Iowa. Lorenzo Snow wrote in his journal about the first camp of pioneers at Sugar Creek, Iowa, describing his family living in a tent during snowstorms. He felt "to rejoice in having accomplished this much towards freeing ourselves from the land of Gentile oppression, and we felt as tho we could breath more freely and speak one with another upon those things where in God had made us free." He tells of the slow progress across Iowa due to the rainy, muddy conditions and the difficulty they had in getting corn to supply the camp's animals. They camped at Garden Grove, where Lorenzo experienced "a severe fit of sickness" that led his family to despair of his chances of surviving. Read his account of his experiences in Iowa in full in the article linked below.