Henry Tapscott in Indiana

I just got through posting the following on Ancestry.com, but I may reach other people through this blog.

Following the death of his father, William the Preacher, in March 1837, Henry Tapscott head north from Green County, Kentucky, traveling through Indiana and ending up in Clark County Illinois in 1840. During this three-year trip, Henry and his wife, Susan Bass, had two children, Sarah Ann Tapscott and Frances Ann Tapscott, both born in Indiana. (Before making the trip Henry and Susan had six other children born in Kentucky and after the trip, four additional born in Clark County Illinois.) In a few weeks I will be making the same trip to research a book on Henry and his descendants, but I face a serious problem. So far I have been unable to determine what Indiana counties Henry passed through or in which Indiana counties his children Sarah and Frances were born. It is sometimes claimed that they were born in Allen County Indiana, but not only is there no reliable evidence for this, Allen County does not lie on any reasonable route between Green County Kentucky and Clark County Illinois. Does anybody out there have any evidence of where Henry was in Indiana?