I'm sure you've heard the first four, the fifth was written by Oliver Holmes around fifty years after Key wrote the well known stanzas. Here's the fifth, it doesn't get much air time sadly.
When our land is illumined with Liberty's smile, If a foe from within strike a blow at her glory, down, down with the traitor that dares to defile The flag of her stars and the page of her story! By the millions unchained, who our birthright have gained, We will keep her bright blazon forever unstained! And the Star-Spangled Banner in triumph shall wave while the land of the free is the home of the brave.
When our land is illumined with Liberty's smile, If a foe from within strike a blow at her glory, down, down with the traitor that dares to defile The flag of her stars and the page of her story! By the millions unchained, who our birthright have gained, We will keep her bright blazon forever unstained! And the Star-Spangled Banner in triumph shall wave while the land of the free is the home of the brave.