On April 23, 1920, Brennan knocked out Walter "Farmer" Lodge, also known as "Soldier" Lodge in the third round at the Moose Club in Detroit, Michigan.
Brennan fought future Hall of Famer Billy Miske twice in 1919, once on June 28 in Oklahoma to a fifteen-round loss on points, and on April 28 at Cardinal Field in St. Louis to an eight-round newspaper decision draw [REF].