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Gingrich, Newt, and William R. Forstchen. Gettysburg: A Novel of the Civil War, St. Martin's/Thomas Dunne 2003.

Gingrich, Newt, William R. Forstchen, and Albert S. Hanser. Civil War Trilogy
Divergence: 1863 CE
What if: Confederate troops attempted one last attack on Cemetery Hill before sundown on July 1, 1863, and were bloodily repulsed.
Series note: A trilogy including Gettysburg: A Novel of the Civil War, Grant Comes East: A Novel of the Civil War, and Never Call Retreat: Lee, Grant, and the Final Victory.
Comments: The books themselves do not actually indicate a series name, aside from subtitles saying "A Novel of the Civil War". The authors have elsewhere referred to the series as "Active History".

Gingrich, Newt, William R. Forstchen, and Albert S. Hanser. Gettysburg: A Novel of the Civil War
Divergence: 1863 CE
Summary: The story of the four-day battle on the Pennsylvania-Maryland border. After the Confederacy is repulsed at Cemetery Hill, Robert E. Lee becomes willing to explore Longstreet's plan to flank Union troops on the south. Action shifts from the ridge below Gettysburg to points further south, with a battle at Taneytown and then the destruction of the Army of the Potomac along Pipe Creek.
Series note: First of a Civil War Trilogy.
Comments: For an alternative take on and an alternative result to Longstreet's flanking plan, see Peter G. Tsouras's Gettysburg: An Alternate History. For an alternative battle at Pipe Creek, see Douglas Lee Gibboney's Stonewall Jackson at Gettysburg.
Published: St. Martin's/Thomas Dunne 2003 (031230935XBUY); Thorndike 2003 (0786259574); St. Martin's Griffin (0312309368BUY).
Publication note: Also known as Gettysburg: Lee's Greatest Victory during development.

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Gingrich, Newt, and William R. Forstchen. Grant Comes East: A Novel of the Civil War, St. Martin's/Thomas Dunne 2004.

Gingrich, Newt, William R. Forstchen, and Albert S. Hanser. Grant Comes East: A Novel of the Civil War
Divergence: 1863 CE
Summary: During the month following the Union disaster at Union Mills, Lee's army attempts an attack against well-defended Washington and then moves on to capture Baltimore. All the while, Ulysses Grant is forming a new Union Army of the Susquehanna at Harrisburg, and Dan Sickles looks for an opportunity to use the remnants of the Army of the Potomac against the Confederates, and in doing so falls into Lee's trap.
Series note: Second of a Civil War Trilogy.
Published: St. Martin's/Thomas Dunne 2004 (0312309376BUY); Thorndike 2004 (0786269332); St Martin's/Griffin 2005 (0312309384BUY).

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Gingrich, Newt, and William R. Forstchen. Never Call Retreat: Lee and Grant: The Final Victory: A Novel of the Civil War. St. Martin's/Thomas Dunne 2005.

Gingrich, Newt, William R. Forstchen, and Albert S. Hanser. Never Call Retreat: Lee and Grant: The Final Victory: A Novel of the Civil War
Divergence: 1863 CE
Summary: After the Army of the Potomac is destroyed, Grant begins moving the Army of the Susquehanna south. Disrupted plans and the odd bit of intelligence lead both Grant and Lee toward Frederick, Maryland, where Custer's Last Charge begins the carnage that is the four-day Battle of the Monocacy which will end the Civil War.
Series note: Third of a Civil War Trilogy.
Published: St. Martin's/Thomas Dunne 2005 (0312342985BUY), 2006 (0312342993BUY).
Publication note: Also known as To the Last Man: Lee, Grant, and the Final Victory during development.