One of my favorite hymns, which I sang with my high school chorus, is the Civil War song, Battle Hymn of the Republic. I didn't understand the religious imagery ("He is trampling out the vintage where the grapes of wrath are stored") until I read it in the Bible in Isaiah and Revelation (far be it from school to teach such things).
In the beauty of the lilies Christ was born across the sea,
With a glory in His bosom that transfigures you and me:
As He died to make men holy, let us die to make men free,
While God is marching on.
Many people have died in the cause of freedom, but one Person died to make us all free.