William H. Brennan (February 12, 1893 – October 19, 1950) was an American football player who played eight seasons for the Chicago Cardinals.
[1] He played for independent teams from 1907 or 1908 until signing with the Cardinals in 1920, with which he would play until retiring following the 1927 season.
He also was a noted police officer, and was still able to serve full-time even during his football career.
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