Our national anthem is certainly a wonderful piece of music. I find it interesting that the music for the poem that Francis Scott Key wrote was set to the music of a British tune that was popular at the time.
“The poem was set to the tune of a popular British song written by John Stafford Smith for the Anacreontic Society, a men's social club in London. "The Anacreontic Song" (or "To Anacreon in Heaven"), with various lyrics, was already popular in the United States. Set to Key's poem and renamed "The Star-Spangled Banner", it would soon become a well-known American patriotic song. With a range of one octave and one fifth (a semitone more than an octave and a half), it is known for being difficult to sing. Although the poem has four stanzas, only the first is commonly sung today.” --- Wiki
Interestingly enough, I heard this semi-popular anthem just this evening. It is a tribute not to a single battle, but an entire war.