The Further Adventures of the Girl Spy(1910)

"[The Girl Spy] is sent by a Confederate general to learn the Union plans of campaign. She arrives at the tavern where she overhears the plans [...] and escapes. She is pursued, but in the disguise of a boy she succeeds in eluding the enemy, once dropping from a tree to the back of a horse and riding away. Finally she delivers her notes of the Federal plans to the Confederate headquarters, and receives the thanks and praise of her superiors." —The New York Dramatic Mirror.