"The Battle Hymn of the Republic" is a song written by Julia Ward Howe in 1861 during the American Civil War. It was inspired by the Union Army and reflects the moral fervor of the time, emphasizing themes of justice and righteousness. The song's powerful lyrics convey a sense of purpose and determination in the fight against slavery. The melody of the hymn is based on the song "John Brown's Body," which was popular among soldiers. Over the years, "The Battle Hymn of the Republic" has become an anthem for various social justice movements, symbolizing the ongoing struggle for equality and human rights.