See D. S. Freeman, Lee's Lieutenants (3 vol., 1942-44).
William Henry Fitzhugh Lee (May 31, 1837 – October 15, 1891), known as Rooney Lee or W.H.F. Lee, was the second son of Robert E. Lee and Mary Anna Randolph Custis. He was a planter, a Confederate cavalry General in the American Civil War, and later a member of the U.S. Congress.
After the Battle of South Mountain, Lee was promoted to brigadier general. He fought at Antietam under the command of Brig. Gen. Fitzhugh Lee, his cousin. He commanded the 3rd Brigade of Stuart's Cavalry Division at the Battles of Fredericksburg and Chancellorsville. He was wounded during combat at Brandy Station at the beginning of the Gettysburg Campaign and was captured by Union forces at Hickory Hill, Virginia, two weeks later, while recuperating. He was a prisoner of war in New York State until exchanged back to the Confederate Army on February 25, 1864. He was exchanged for captive Union Brig. Gen. Neal S. Dow. In April, he was promoted to major general and commanded a division in the Cavalry Corps during the breakout from Petersburg and the retreat of his father's army in the Appomattox Campaign. By the end of the war, he had risen to second-in-command of the Confederate cavalry. He surrendered along with his father at Appomattox Court House.
After his mother died in 1873, Rooney inherited Ravensworth Estate, the old Fitzhugh family property (near present-day Springfield) in Fairfax County with 563 acres of land. He moved there from White House. In 1875 Rooney was elected to the Virginia Senate, serving until 1878. He was then elected as a Democrat to the US House of Representatives in 1887. He served in the House until his death at Ravensworth in 1891. He is interred in the Lee Chapel at Washington and Lee University in Lexington, Virginia with his parents and siblings.
On November 28, 1867, he married Mary Tabb Bolling, a descendant of Colonel Robert Bolling and his second wife Anne Stith. They had two children: Robert Edward Lee, born 1870, and George Bolling Lee, born 1872.
Lee is the step-great-great-grandson of George Washington. Lee's mother, Mary Anna Randolph Custis Lee, was the great-granddaughter of Martha Custis Washington, who was a widow living at her White House Plantation in New Kent County (which Rooney Lee later inherited) when she was courted by Colonel George Washington before their marriage in 1759.