Which conflict results from Barbara Frietchie putting the flag back in her attic window?

Barbara Frietchie was a civic heroine during the Civil War. She is famous for displaying the Union flag in her attic window in Frederick, Maryland, despite the fact that the town was under Confederate control at the time. Her action caused a minor conflict, as Confederate General Stonewall Jackson ordered his troops to take down the flag. However, Barbara Frietchie's supporters claimed that she was too old to have climbed to the attic window and that the story was a myth, so the authenticity of the conflict is still a subject of historical debate.