1918 – Christy Mathewson resigns as Reds manager to accept a commission as a captain in the chemical warfare branch of the Army.

This Day In Baseball

On August 27, 1918 — 1918 – Christy Mathewson resigns as Reds manager to accept a commission as a captain in the chemical warfare branch of the Army.

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Sources:
Baseball Reference August 27
National Pastime August 27
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game