November 28, 1974 - This was Denver's first appearance in a Thanksgiving Day game. The Broncos had traveled to Detroit to face the Lions in their annual Thanksgiving Day game. Thanksgiving Day games date back to 1876 for college teams, and the early 1890s for professional teams; the Lions began their tradition in 1934.
Denver took a 10-3 lead in the second quarter but trailed 17-10 going into the locker room for the half. The third quarter, however, belonged entirely to the Broncos as they scored three times (Jon Keyworth 1-yard run, Otis Armstrong 1-yard run, Charley Johnson to Riley Odoms 1-yard pass) to take a 31-20 lead. Detroit scored once in the fourth quarter but could not overcome Denver's lead. The final score stood at Denver 31, Detroit 27.