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RICHMOND, VA - APRIL 16: In this image from the U.S. Library of Congress, Confederate Gen. Robert E. Lee stands for a portrait April 16, 1865 in Richmond, Virginia. (Photo by Mathew Brady/U.S. Library of Congress via Getty Images)

RICHMOND, VA - APRIL 16:   In this image from the U.S. Library of Congress, Confederate Gen. Robert E. Lee stands for a portrait April 16, 1865 in Richmond, Virginia. (Photo by Mathew Brady/U.S. Library of Congress via Getty Images)

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circa 1863: Confederate General Robert E Lee (1807 - 1870). Lee was offered the command of the Union Army but although personally opposed to both slavery and secession, his loyalty to Virginia led to his taking command of the Confederate forces. (Photo by Hulton Archive/Getty Images)

circa 1863:  Confederate General Robert E Lee (1807 - 1870). Lee was offered the command of the Union Army but although personally opposed to both slavery and secession, his loyalty to Virginia led to his taking command of the Confederate forces.  (Photo by Hulton Archive/Getty Images)

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American Confederate Army general Robert E Lee (1807 - 1870), circa 1865. From a painting by Cornelius Hankins. (Photo by Keystone View Company/FPG/Archive Photos/Getty Images)

American Confederate Army general Robert E Lee (1807 - 1870), circa 1865. From a painting by Cornelius Hankins. (Photo by Keystone View Company/FPG/Archive Photos/Getty Images)

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Portrait of General Robert E. Lee (1807 - 1870), commander of the Confederate Army of Northern Virginia, during the American Civil War, 1860s. (Photo by PhotoQuest/Getty Images)

Portrait of General Robert E. Lee (1807 - 1870), commander of the Confederate Army of Northern Virginia, during the American Civil War, 1860s. (Photo by PhotoQuest/Getty Images)

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American Confederate Army general Robert E Lee (1807 - 1870), 1867. (Photo by Mathew Brady/Keystone View Company/FPG/Archive Photos/Getty Images)

American Confederate Army general Robert E Lee (1807 - 1870), 1867.  (Photo by Mathew Brady/Keystone View Company/FPG/Archive Photos/Getty Images)