Another change in casting has been announced by the production team: Jason O’Mara will portray General George B. McClellan in To Appomattox . O’Mara was originally cast as McClellan, but due to commitments on “Terra Nova,” had to take on the more minor role of Simon Bolivar Buckner. But with that series cancelled, and D.B. Sweeney stepping into the role of James Longstreet, O’Mara is now back on to play “Little Mac.” This change was announced today on the Facebook page, and on the official website.

