Clara Barton earned the nickname "Angel of the Battlefield" for her tireless efforts in providing care and aid to wounded soldiers during the Civil War.

As a nurse, she bravely ventured onto the front lines, delivering supplies, tending to the injured, and offering comfort to those in need. After the war, she founded the American Red Cross, further cementing her legacy as a pioneering humanitarian. Barton's dedication to nursing and her advocacy for the rights of others made her a significant figure in both medical care and social reform during her time.