After staying home in Mulberry Grove for about a week, William Fleming, his wife Nancy, and two sons went to Christian and Moultrie Counties in Illinois, staying about two weeks before returning home.
Christian County is about 45 miles straight north of Mulberry Grove, and Moultrie County is just east of there. They likely visited both of their parents, siblings and their families. Many of the Fleming's were living in those two counties before, during and after the Civil War.
William and Nancy previously lived in DeWitt County, just a little further to the north. Their oldest son James was born there in 1858, and the 1860 census showed them living in Waynesville in DeWitt County.
Additionally, Nancy Ann Leigh's parents and some of her siblings were also in DeWitt County, according to the 1860 census.
So, William and Nancy probably had many family and friends to visit in central Illinois during those two weeks.