On Mrs. Quisenberry's Farm

Source

"During the war the rebel government had established on Mrs. [Elizabeth Rousby] Quisenberry's farm their permanent signal station to communicate with other rebels in Maryland, and hold open their mail route to the North and Canada. The signal officers, as a rule, were genteel men, and they all thought highly of their hostess, who was then about fifty years old. They occupied the school-house, at least two of them did, and one of these was a Maryland gentleman named Thomas Harbin. This man was one of the original confidants of John Wilkes Booth in the scheme to abduct President Lincoln."

The excerpt above was taken from the Genealogical memoranda of the Quisenberry family and other families, including the names of Chenault, Cameron, Mullins, Burris, Tandy, Bush, Broomhall, Finkle, Rigg, and others (1897). 

See this blog for several interesting pictures of Mrs. Quisenberry's farm and the surrounding area.