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Posted at 2:15 PM ET, 09/ 1/2010

The thunderstorm and the Battle of Ox Hill

By Kevin Ambrose

In the rain, the Union Army retreats to Washington the day after the Battle of Second Manassas, Aug. 31, 1862. The Confederate Army was in pursuit, chasing the Union troops eastward toward Washington. On the following day, the Battle of Ox Hill occurred just northwest of Fairfax, Va., during an intense thunderstorm that made the soldier's black powder weapons unserviceable, helping turn the fierce battle into a muddy stalemate. Source: Washington Weather

Earlier this summer, I wrote a post about a thunderstorm that helped save Washington from fires that were set by an invading British army in 1814. The storm's heavy rains extinguished the flames and prevented the British from lighting more fires in the city.

There is one more example of a thunderstorm that thwarted the efforts of an attacking army with plans to conquer Washington. Fast forward from the year 1814 to 1862, exchange the British Army with the Confederate Army, and exchange one drenching thunderstorm for another. It was a severe thunderstorm on Sept. 1, 1862, which played a very important role in changing the course of a major Civil War battle that occurred near Fairfax, Va. This is the story of the thunderstorm and the Battle of Ox Hill...

A Civil War scene in Washington. Source: Library of Congress

The battlefield is not well-known and it does not have the volume of visitors like Gettysburg or Manassas. Nevertheless, the battle and the thunderstorm played a very important role in shaping the outcome of the Civil War.

On a high hill west of Fairfax, a fierce Civil War battle was fought in a blinding thunderstorm on Sept. 1, 1862. Two well-known Union generals were killed, and over 2,000 casualties occurred in the dramatic fight that was greatly influenced by a line of thunderstorms associated with a strong cold front. The Battle of Ox Hill, also known as the Battle of Chantilly, is the only major Civil War battle to have been fought during a storm. To explain the Battle of Ox Hill, we need to start with the Battle of Second Manassas.

Guarding the Potomac River near Washington during the Civil War. Source: Library of Congress

In the closing days of August 1862, Union General John Pope's Army of Virginia suffered a defeat at the Battle of Second Manassas. The Union army, beaten but still intact, retreated toward the fortifications around Washington. General Lee, commander of the Confederate Army, hoped to circle around the retreating Union forces and block their route, thus giving the Confederates a clear avenue into Washington. The location that General Lee had chosen to block the Union Army was the Jermantown crossroad, located just west of Fairfax.

Lee's strategy was to take Stonewall Jackson's Corps around the north side of the Union Army in a long, flanking move along the road that is now modern-day Route 50. To divert attention from Jackson's flanking move, Longstreet's Confederate Corps stayed visible behind the Union Army on the road that is now modern-day Route 29. Meanwhile, Jeb Stuart's cavalry of 5,000 rode ahead of Jackson's Corps to scout Pope's movements. Lee had planned for his armies to converge west of Fairfax and block Pope's Union Army. As this maneuver began, there were cloudy skies with an increasing southerly wind. Clouds were noted to "race across the sky." Threatening weather was looming.

As Jackson's men were circling around the retreating army, Pope began to realize that a flanking move was underway by the Confederates because Jeb Stuart had attacked a wagon train east of Chantilly, Va., which alerted the Union Army. This alarmed Pope who sent Union General Issac Stevens and a small force of 4,000 soldiers toward the Confederates. Stevens' forces surprised Jackson's men at Ox Hill, located near the present-day West Ox Road and Fairfax Town Center. Jackson abandoned his march toward the crossroads and went into a defensive position. At this time, the sky was darkening and the wind was blowing strong from the south, with flashes of lightning on the horizon.

Brig. General Issac Stevens was the first Union general killed during the Battle of Chantilly. He was shot about the same time as a fierce thunderstorm hit the area.Source: Library of Congress

General Stevens, knowing he had surprised Jackson, made a courageous decision to immediately attack the Confederate brigades who were just starting to deploy into a defensive line. Stevens' first advance stalled in the face of a massive volley that caused numerous casualties among the Union ranks, including the general's son, Captain Hazard Stevens. The fighting began around 4:30 p.m., about the same time the thunderstorms were moving toward the battlefield.

General Stevens, distraught about having seen his son fall in battle, decided to attack again while Jackson was still off balance. He grabbed a regimental flag from a wounded color bearer and personally led the charge. General Stevens was an easy target holding the battle flag and was quickly shot and killed. By now, the rain had started to fall heavily and began causing the soldier's black powder rifles to become unserviceable. With the rain in their favor, the outnumbered Union soldiers crashed through the center of the Confederate line. The Confederates, disorganized and confused, withdrew in considerable disorder. As the Confederates retreated, General Jubal Early's Brigade of Virginians arrived, filled the breach, and stopped the Union advance.

As the fighting continued, the sky became as dark as night and the thunderstorm lashed the soldiers with extremely heavy rain, strong winds and frequent lightning. The booms of cannons mixed with the loud explosions of thunder. The storm reduced visibility and the soldiers had a difficult time seeing their enemy. Sheets of rain blew horizontally across the battlefield, soaking the soldiers. Private Greely of the 19th Massachusetts recorded:

The roll of musketry and the roar of cannon left all of us unmoved, but the crash of thunder and the vividness of the lightning, whose blinding flashes seemed to be in our very midst, caused the uneasiness and disturbance among some of the bravest men.

Major General Philip Kearney was the second Union general to be killed during the Battle of Ox Hill. Source: Library of Congress

The storm and rain continued as did the battle, and the intensity of the fighting did not diminish. Although the Confederates were caught off-guard by the Union attack, the hardened and tenacious Confederate veterans began to take control of the battle. The Union soldiers were slowly being driven back through the mud and rain. Fortunately, for the retreating Union troops, General Philip Kearny arrived with reinforcements. Hoping to reinvigorate the attack and urge the Union forces forward, Kearny pushed ahead of his men despite being warned of the danger. He remarked, "The Rebel bullet that can kill me has not yet been molded."

With terrible visibility from the storm, General Kearny rode right up to the Confederate line. When he realized his mistake, he turned his horse and galloped through the mud back toward his division. The Confederates opened fire and Kearny was shot off of his galloping horse and was killed. The body of Kearny was returned to the Union Army with a personal note from Robert E. Lee. At the time, it was rumored that Lincoln was thinking of replacing McClellan with Kearny as the commander of the Union Army.

As the drenching rain continued, dry black powder cartridges became scarce and rifles misfired so often that the commanders told their troops to "give them the bayonet." A series of bayonet charges ensued. Finally, after over two hours of fierce hand-to-hand fighting, the heavy rain and chilling temperatures began to dampen the will of the soldiers to fight. The Union army withdrew in the darkness and the Confederates held the field. Technically, it was a Confederate victory, but Lee had failed to accomplish his goal of stopping Pope's Army and marching into Washington. The Union Army retreated to Washington and the Confederates later turned north, setting the stage for the bloody Battle of Antietam.

The thunderstorms that occurred during the battle were associated with a strong, early-season cold front. The front was also accompanied by strong winds. Before the battle, the wind was strong from the south, recorded by the Naval Observatory in Washington to be at "Force 6." (The Wind Force Scale ranged from 1 to 10 and was based on estimation.) The next day, on Sept. 2, the Naval Observatory recorded winds from the northwest at "Force 4," and military records noted that northwest gales hampered shipping on the Potomac River. The Naval Observatory also recorded that 1.08 inches of rain fell during the storm of Sept. 1, and they included the following remark: "Commenced an exceedingly heavy rain, with lightning and thunder, at 5:45 p.m."

The loss of Kearny and Stevens was a tremendous blow to the Union. Both men were popular and well-respected generals. In honor of Kearney, the U.S. Army began the tradition of awarding medals called the Kearny Cross for acts of courage. Soon afterward, Congress authorized what is now known as the Congressional Medal of Honor. Hazard Stevens, General Stevens' son, recovered from his injuries suffered during the battle.

The Battle of Ox Hill was eventually overshadowed by the Battle of Second Manassas and by the Battle of Antietam. However, had the fierce thunderstorms not occurred, the Battle of Ox Hill may have turned out quite differently, potentially altering the course of the war. Without the storm, the Confederates had a chance of stopping General Pope and making a move on Washington.

The Ox Hill Battlefield Park is located near Fairfax Town Center and represents a small portion of the battlefield.

Sources: "Washington Weather" and "Tempest at Ox Hill: The Battle of Chantilly"

By Kevin Ambrose  | September 1, 2010; 2:15 PM ET
Categories:  Education, Photography, Thunderstorms  
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Posted by: wiredog | September 1, 2010 2:46 PM | Report abuse

Fascinating...not. How about an update on something that matters, like, oh I don't know, the Hurricane?

Posted by: trollboy69 | September 1, 2010 3:42 PM | Report abuse

Accounts such as this one help keep contemporary weather in perspective.

"Washington Weather" is a gold mine of such accounts, dating back to the earliest mid-Atlantic colonists. My favorite: The Washington and Jefferson snowstorm of 1772, which must be the mother of all recorded snowfalls hereabouts.

Posted by: JerryFloyd1 | September 1, 2010 3:47 PM | Report abuse

I actually enjoyed this very interesting and well-written account.

Awhile back, I read an interesting book entitled Ranger Mosby which features a lot of local CW action and includes some interesting accounts of snow storms during that time period. Recommended.

Posted by: spgass1 | September 1, 2010 4:19 PM | Report abuse

spgass1, I just finished a book on Mosby's Rangers last week. The accounts of weather and snowstorms during the Civil War were very interesting. Civil War weather seems to map very closely to what we see today in our region, with the obvious exception of last winter's snow.

Posted by: Kevin-CapitalWeatherGang | September 1, 2010 5:13 PM | Report abuse

Ah I know where that park is, well at least I know where it should be. I've driven past that a ton of times and never realized what it was. It's funny how when i was young I didn't want to know anything about history and the older I get the more interested I am in it.

Posted by: paul-Sterling | September 2, 2010 9:01 AM | Report abuse

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