Celestial sleuths shed (moon) light on death of Stonewall Jackson

Apr 30, 2013 by Jayme Blaschke
Thomas J. “Stonewall” Jackson in a photograph dated by historians to April 1863, only a few weeks before the Battle of Chancellorsville. (From the collection of Donald Olson)

One of the turning points of the U.S. Civil War occurred during the Battle of Chancellorsville, May 2, 1863, when Confederate Lieutenant General Thomas J. "Stonewall" Jackson was mistakenly shot by his own troops and later died of complications from his wounds. His death deprived Confederate commander Robert E. Lee of his most daring and trusted general two months before the fateful Battle of Gettysburg.

Almost from the day of Jackson's wounding, have debated the central question: How could the soldiers of the 18th North Carolina regiment not recognize their famous general and gun him down? Now, on the 150th anniversary of the historic event, Don Olson of Texas State University and Laurie E. Jasinski, Texas State graduate and editor of The Handbook of Texas Music, Second Edition, have answered that perplexing question by looking to the .

Olson and Jasinski publish their findings in the May 2013 issue of Sky & Telescope magazine, on newsstands now.

Moon Over Chancellorsville

The Battle of Chancellorsville is an outlier among clashes in that the fighting continued well after sunset on May 2. The Union army was in disarray after being routed by Jackson's famous "flank attack" in the late afternoon. Jackson hoped to cut off their lines of retreat, and a bright full moon allowed the rarity of night combat to continue. Many scholars after the fact claim the night was very dark, but eyewitness accounts testify otherwise.

A full Moon illuminates the scene as General A. P. Hill binds the wounds of Stonewall Jackson minutes after the fatal volley at Chancellorsville. (Robert K. Krick)

"The moon was shining very brightly, rendering all objects in our immediate vicinity distinct…." wrote Confederate Captain William Fitzhugh Randolph in The Confederate Veteran, December 1903. "The moon poured a flood of light upon the wide, open turnpike,"

Jackson, along with Randolph and several other staff officers, rode ahead to scout out possible routes that could be used to get between the Union army and the fords and pontoon bridges along the Rappahannock River. As the party returned from their reconnaissance expedition at approximately 9 p.m., a Confederate officer on the left wing of the 18th North Carolina regiment spotted them through the trees by the moonlight, and, mistaking the group for Union cavalry, ordered his men to open fire. Jackson was wounded by three bullets—two in his left arm and one striking his right wrist. Upon hearing of the wounds that forced the amputation of Jackson's arm, Lee lamented, "He has lost his left arm; but I have lost my right arm."

Stonewall Jackson and his escort rode forward from the Confederate lines to carry out a reconnaissance. According to Confederate officer Colonel Edward P. Alexander, “Jackson, followed by several staff-officers and couriers, rode slowly forward upon an old road, called the Mountain road...Jackson, at the head of his party, was slowly retracing his way back to his line of battle, when this volley firing began. Maj. Barry, on the left of the 18th N.C., seeing through the trees by the moonlight a group of horsemen moving toward his line, ordered his left wing to fire.” The calculations in this article for the direction of the rising Moon show that the moonlight silhouetted Jackson and his party as they rode back toward the Confederate battle lines — the riders would have appeared as dark figures, not recognizable. The dispositions of the Confederate and Union regiments at the moment of the fatal volley follow the definitive historical analysis by Robert K. Krick in The Smoothbore Volley That Doomed the Confederacy (LSU Press, 2002). (Map courtesy of Sky & Telescope magazine)

Looking to the Light

But if the full moon shone so brightly, how did Jackson's own troops mistake his party for Union cavalry? The answer lies in the position of the moon. Using detailed battle maps and astronomical calculations, Olson and Jasinski determined that the 18th North Carolina was looking to the southeast, directly toward the rising moon. Reaching 25 degrees above the horizon at 9 p.m., the bright moon would've silhouetted Jackson and his officers, completely obscuring their identities.

"When you tell people it was a bright moonlit night, they think it makes it easier to see. What we are finding is that the 18th North Carolina was looking directly toward the direction of the moon as Stonewall Jackson and his party came riding back," Olson said. "They would see the riders only as dark silhouettes. Now, 150 years later, we can explain why they didn't recognize this famous Confederate general. Our astronomical analysis partially absolves the 18th North Carolina from blame for the wounding of Jackson."

Explore further: Bright points in Sun's atmosphere mark patterns deep in its interior

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Egleton
not rated yet May 02, 2013
You Yanks are famous for bombing your allies.

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