Rank and organization:   Boatswain's Mate, U.S. Navy. Born: 1826, Massachusetts.
Accredited to: Massachusetts. G.O. No.: 45, 31 December 1864.
On board the U.S.S. Brooklyn during successful attacks against Fort Morgan,
rebel gunboats and the ram Tennessee in Mobile Bay, on 5 August 1864. Despite
severe damage to his ship and the loss of several men on board as enemy
fire raked her decks from stem to stern, Dennis displayed outstanding skill
and courage in operating the torpedo catcher and in assisting in working
the bow chasers throughout the furious battle which resulted in the surrender
of the prize rebel ram Tennessee and in the damaging and destruction of
batteries at Fort Morgan.
This data was extracted from the Committee on Veterans' Affairs, U.S. Senate, Medal of Honor Recipients: 1863-1973 (Washington, D.C.: Government Printing Office, 1973)