Known during the Civil War as the "Angel of the Battlefield," remarkable Clara Barton risked everything to save countless lives on the frontlines of battle. Once a painfully timid child, Clara was as bold as a lion when it came to helping others, whether wayward schoolboys, natural-disaster victims, or dying soldiers. Clara fought for U.S. approval of the Geneva treaty for the care of war wounded, organized the American Red Cross, and tirelessly...