Henderson's biography of Jackson with him on campaigns. Alexander Vandegrift also idolized Jackson. His last words, "Let us cross over the river, and rest under the shade of the trees" were the inspiration for the title of Ernest Hemingway's 1950 novel Across the River and into the Trees. Descendants Jackson's grandson and great-grandson, both namesakes, Thomas Jonathan Jackson Christian (1888–1952) and Thomas Jonathan Jackson Christian Jr. (1915–1944), both graduated from West Point. The elder Christian was a career US Army officer who served during both World Wars and rose to the rank of brigadier general. Thomas Jonathan Jackson Christian's parents were William Edmund Christian and Julia Laura Christian. Julia was the daughter of Stonewall Jackson and his bride Mary Anna Morrison. The younger Christian was a colonel in command of the 361st Fighter Group flying P-51 Mustangs in the European Theater of Operations in World War II when he was killed in action in August 1944; his personal aircraft, Lou IV, was one of the most photographed P-51s in the war. Commemorations As an important element of the ideology of the "Lost Cause", Jackson has been commemorated in numerous ways, including with statues, currency, and postage. A poem penned during the war soon became a popular song, "Stonewall Jackson's Way". The Stonewall Brigade Band is still active today. West Virginia's Stonewall Jackson State Park is named in his honor. Nearby, at Stonewall Jackson's historical childhood home, his uncle's grist mill is the centerpiece of a historical site at the Jackson's Mill Center for Lifelong Learning and State 4-H Camp. The facility, located near Weston, serves as a special campus for West Virginia University and the WVU Extension Service. During a training exercise in Virginia by U.S. Marines in 1921, the Marine commander, General Smedley Butler was told by a local farmer that Stonewall Jackson's arm was buried nearby under a granite marker, to which Butler replied, "Bosh! I will take a squad of Marines and dig up that spot to prove you wrong!" Butler found the arm in a box under the marker. He later replaced the wooden box with a metal one, and reburied the arm. He left a plaque on the granite monument marking the burial place of Jackson's arm; the plaque is no longer on the marker but can be viewed at the Chancellorsville Battlefield visitor's center. Beginning in 1904 the Commonwealth of Virginia celebrated Jackson's birthday