Why did Barbara frietchie put a flag in her attic window?

Barbara Frietchie put a flag in her attic window as a patriotic act to show her support for the Union during the Civil War. Despite the advancing Confederate troops, she wanted to demonstrate defiance and loyalty to her country. Her courageous gesture became a symbol of resistance and has been immortalized in the poem "Barbara Frietchie" by John Greenleaf Whittier. This act of bravery highlighted the spirit of loyalty and determination during a tumultuous time in American history.