A 14-year battle over the fate of a modern structure at the heart of Gettysburg National Military Park is over.

The National Park Service said Thursday that it would begin demolishing the Cyclorama building as soon as February, clearing the site ahead of the 150th anniversary commemoration of the battle.

The site will be restored to its 1863 appearance, complete with a period apple orchard and replicas of the wood fences that once crisscrossed the fields, park spokeswoman Katie Lawhon said. The massive painting that the building once housed has been separately preserved....