The Thompson and Powell Martyrs Monument is a place on the National Register of Historic Places in St. Joseph, Kentucky, one of only three locations of the NRHP in Daviess County, Kentucky that is not in Owensboro, Kentucky. The two men were killed on July 22, 1864. They were originally held in Daviess County, but were taken to Henderson by Federal troops to be killed. Fearing retaliation, many of the Union-sympathizing citizens of Henderson fled the city, even though Sypert sent a proclamation to the city, stating: