Henry M. Hardenbergh was a veteran of the American Civil War and a recipient of the Medal of Honor.

[2] On August 16, 1864, Hardenbergh and the 39th Illinois Veteran Volunteer Infantry took part in a 200-yard charge on Confederate fortifications in Henrico County, Virginia.

After breaching the Confederate fortifications, Hardenberg engaged in hand-to-hand combat with the color bearer of the 10th Alabama Infantry.

Following the battle, Hardenbergh presented the captured flag to Union General David B. Birney.

[6][7] On August 16, 1995, a marker was erected by Bremen Township near Richmond, Virginia, near where Hardenbergh fought during the Second Battle of Deep Bottom.