What were the circumstances of Christy Mathewson’s final game?

Coincidently, Mathewson faced Mordecai Brown in the game that proved to be the finale for both pitchers. On September 4, 1916, Mathewson, who was managing the Reds, pitched his only game of the season, beating Brown and the Cubs 10-8 in the final game of a doubleheader. Both future Hall of Famers went the distance, Matty yielding 15 hits and Brown 19.