During the 1800s, daring and courageous girls across America left their unique mark on history. Milly Cooper galloped 9 miles through hostile Indian Territory to summon help when Fort Cooper was under attack. Belle Boyd risked her life spying for the Rebels during the Civil War. Kate Shelly, when she was 15, crawled across a nearly washed-out railroad bridge during a ferocious thunderstorm to warn the next train. Lucille...