Career
Born in 1832 in Ireland, Brennan joined the United States Navy from Boston, Massachusetts in May 1861. He initially served as a seaman on the United States Ship Colorado. At the Battle of Forts Jackson and Saint Philip near New Orleans on April 24, 1862, he joined the United States Ship Mississippi and manned one of that ship"s guns through the engagement.
Brennan re-enlisted twice more, and was promoted to Acting Master"s Mate in November 1863.
He deserted from the Navy in August 1864, and the remainder of his life is unknown. On board the United States.S. Mississippi during attacks on Forts Jackson and Saint Philip and during the taking of New Orleans, 24–25 April 1862.
Taking part in the actions which resulted in the damaging of the Mississippi and several casualties on it, Brennan showed skill and courage throughout the entire engagements which resulted in the taking of Saint Philip and Jackson and in the surrender of New Orleans.
