In 1777, the American Revolution is well underway. At 16, Sybil Ludington knows the war all too well. Her father is a colonel in the Continental Army, battling for America's independence from Great Britain. Colonel Ludington and his regiment are home for the season when word comes that the British Army is attacking nearby. With her father too ill to ride, it's up to young Sybil to alert the American militia that the British are coming.