Never Call Retreat: Lee and Grant: The Final Victory is the conclusion of an alternate history trilogy by former Speaker of the U.S. House of Representatives Newt Gingrich, William R. Forstchen, and Albert S. Hanser. It was published in 2005 by Thomas Dunne Books. The other two books are Grant Comes East and Gettysburg: A Novel of the Civil War. The novel is illustrated with actual photographs of the Civil War, taken somewhat out of context.
The book picks up where the second volume, Grant Comes East left off, after the Confederate victory over the Army of the Potomac. Lee's army meets Grant's army in the bloody "Battle of Frederick".