Thomas F. Harney

Thomas F. Harney was a Confederate explosives expert, who was arrested by the Union Army in the final days of the US Civil War, seemingly en route to bomb the White House. While his initial capture was dismissed as immaterial, as he explained he was a simple engineer delivering ordnance to Mosby, postwar memoirs of Mosby's partisans noted Harney's capture was disastrous and it became clear that he'd been intended to carry out the bombing of the White House. During those same days, Mosby sent his friend Capt. Robert S. Walker to meet with Boyle "to learn the true state of affairs".

Beverly Kennon was tasked with placing Type 5 swaying torpedoes, as sea mines strategically in the Potomac River to hinder any pursuing forces following any success by Harney or Booth's teams.