 Though not having a stellar record, Carroll met some top talent during his career, including Gunboat Smith and two bouts with Battling Levinsky.Carroll lost to Levinsky on March 9, 1916, in New London, Connecticut, in a match promoted by Jewish boxer Abe Hollandersky.On June 12, and July 20, 1917, Brennan achieved two tenth-round newspaper wins at first the Broadway and then the Harlem Sports Clubs against Bob Devere in New York City.