Heyl was appointed a second lieutenant in October 1873. He was promoted to First Lieutenant in March 1882 and served as adjutant of the 23 US Infantry from 1890 to 1891. He was promoted to major and appointed Assistant Adjutant General of the army in May 1898, and became Inspector General of Volunteers in July. He was again promoted to lieutenant colonel in December 1899. He was eventually promoted to colonel in March 1902.
Heyl was buried in Arlington National Cemetery.
Medal of Honor citationEdit
Rank and organization: Second Lieutenant, 23rd U.S. Infantry. Place and date: Near Fort Hartsuff, Nebr., April 28, 1876. Entered service at: Camden, N.J. Birth: Philadelphia, Penn. Date of issue: October 26, 1897.
Voluntarily, and with most conspicuous gallantry, charged with 3 men upon 6 Indians who were entrenched upon a hillside.
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