James Jay Archer

James Jay Archer (December 19, 1817 – October 24, 1864) was a lawyer and an officer in the United States Army during the Mexican–American War. He later served as a brigadier general in the Confederate States Army (CSA) during the American Civil War.
Taken as a prisoner of war on the first morning of the Battle of Gettysburg, Archer was the first general officer captured from Gen. Robert E. Lee's Army of Northern Virginia.
When the American Civil War began in 1861, Archer was stationed in Fort Walla Walla in the Washington Territory. He resigned his commission on May 14, traveled to the South, and joined the Confederate Army as a captain in the Provisional Army. During the 1863 Gettysburg Campaign, Archer's health continued to deteriorate as a result of long marches in the summer heat and humidity. His brigade was now part of the division of Maj. Gen. Henry Heth. Arriving at Gettysburg on July 1, Archer's troops were engaged with Federal cavalry under John Buford for over two hours, before being counterattacked by rapidly arriving Union infantry, including the famed Iron Brigade. Archer became the first general officer to be taken captive from the Army of Northern Virginia since General Lee assumed command.
Archer was finally exchanged late in the summer of 1864, and rejoined the army.
https://en.wikipedia.org/wiki/James_J._Archer