Since his father died when he was 12 years old, he was basically raised by his grandmother, Bridget Polk Clegg, with whom he was living on the 1850 census.
Served as a Sgt., Company G, 5th North Carolina Cavalry Regiment (63rd Volunteers) during the War Between the States. Served throughout the entire war, fighting in the following battles:
• Brandy Station, (his horse shot out from under him), • 3rd day at Gettysburg, • Mine Run Campaign, • Wilderness Campaign, • Spotsylvania Campaign, • Skirmish at Ground Squirrel Bridge • Haw's Shop, • Ream's Station, • Siege of Petersburg, • Wade Hampton's Beefsteak Raid, • Five Forks.
Lee used the 5th as the rear guard of the rear guard to cover the retreat of the Army of Northern VA following Five Forks, and they were destroyed as a unit by a Division of Cavalry under Custer at the "Battle" of Namozine Church, fought the day after Five Forks.
Henry returned to Avent's Ferry in April of 1865, where he was "captured" by elements of Sherman's Army, which was occupying the area at the time.
Henry resumed his life as a farmer and was active in the Buckhorn Methodist Church at Corinth, NC, founded by his father, Rev. William Avent, in 1795.