This series contains letters to and from Switzer from his days as a student at Exeter and Harvard University, to his time as a soldier in World War I, and as a dry goods merchant in Vicksburg, Mississippi after the War. The bulk of the letters, written mostly to family members, describe the daily life of being a soldier, first as a member of the Harvard University ROTC, and then as a Lieutenant on the front lines in France and Germany. Of particular note is a letter describing the calm after the armistice in November 1918. The series is arranged in chronological order.