What is the battle hymn of the republican base on ?

In 1861, after a visit to a Union Army camp, Julia Ward Howe wrote the poem that came to be called "The Battle Hymn of the Republic." It was published in February, 1862, in The Atlantic Monthly.
Howe reported in her autobiography that she wrote the verses to meet a challenge by a friend, Rev. James Freeman Clarke. As an unofficial anthem, Union soldiers sang "John Brown's Body." Confederate soldiers sang it with their own version of the words. But Clarke thought that there should be more uplifting words to the tune.

Howe met Clarke's challenge. The poem has become perhaps the best-known Civil War song of the Union Army, and has come to be a well-loved American patriotic anthem.

The words as published in the February, 1862, issue of The Atlantic Monthly are slightly different from her original manuscript version as documented in her Reminiscences 1819-1899, published in 1899. Later versions have been adapted to more modern usage and to the theological inclinations of the groups using the song.