 He also served in the United States Army from 1917 to 1918, during World War I.In 1924, Prescott was admitted to the Maryland Bar and engaged in private practice as a defense attorney in Rockville.He served as a member of the Rockville City Council from 1924 to 1930, as state's attorney for Montgomery County from 1930 to 1934, and as a member of the Maryland Senate from 1935 to 1938.