Mustered into service as a Private on July 29th, 1861
Born 26 December 1835
Died 10 September 1930
Buried St. Vincents Cemetery, Summit County Ohio
Private Brennan was wounded at the Battle of Brawner Farm on August 28th, 1862 and would be discharged for disability that following November.
He filed for a pension in November of 1863.