Medal of Honor Action Place: Mobile Bay, Alabama, USA
Served on board the U.S.S. Lackawanna during the successful attacks against Fort Morgan, rebel gunboats and the ram Tennessee in Mobile Bay, on 5 August 1864. Displaying great coolness and exemplary behavior as first sponger of a gun, Cassidy, by his coolness under fire, received the applause of his officers and the gun crew throughout the action which resulted in the capture of the prize ram Tennessee and in the destruction of batteries at Fort Morgan.
Accredited to: New York, New York
Awarded Posthumously: No
Born: 1837, Ireland
Died: March 18, 1908, Hampton National Soldier's Home, VA, United States
Buried: Hampton National Cemetery (MH) (B-9503), Hampton, VA, United States