An Irish girl comes to America disguised as a boy to claim a fortune left to her brother who has died.

A young man leaves Ireland for America, but doesn't forget home.

The opening scene of our story shows a Union powder wagon making its way down the road convoyed by a company of mounted Union soldiers. The route of this wagon is reported to Confederate headquarters by one of its spies. Nan, a girl frequently employed by the department of the Confederate army, is called to headquarters and instructed to secure the destruction of the enemy's ammunition train just reported. Nan is fitted out with a Union uniform, mounted on a fast horse and sent on her journey, previously provided with a forged order supposedly signed by a Union general which authorizes her to pass through the lines.