Text:

Onward Christian soldiers!
Marching as to war,
With the cross of Jesus
Going on before.
Christ, the royal Master,
Leads against the foe;
Forward into battle,
See, His banners go!
Onward, Christian soldiers!
Marching as to war,
With the cross of Jesus,
Going on before.

https://www.hymnal.net/en/hymn/h/871

about the history of the song:

Zitat

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The lyric was written as a processional hymn for children walking from Horbury Bridge, where Baring-Gould was curate, to Horbury St Peter's Church near Wakefield, Yorkshire, at Whitsuntide in 1865. It was originally entitled, "Hymn for Procession with Cross and Banners."[4] According to the Centre for Church Music, Baring-Gould reportedly wrote "Onward, Christian Soldiers" in about 15 minutes, later apologising, "It was written in great haste, and I am afraid that some of the lines are faulty."[5] He later allowed hymn-book compilers to alter the lyrics. For example, The Fellowship Hymn Book, with his permission, changed the phrase "one in hope and doctrine" to "one in hope and purpose." For the 1909 edition of Hymns Ancient and Modern, he changed the fifth line of the same verse from "We are not divided" to "Though divisions harass." However, Baring-Gould’s original words are used in most modern hymnals.

Baring-Gould originally set the lyrics to a melody from the slow movement of Joseph Haydn’s Symphony in D, No. 15. This was printed in 1871 in an English church periodical, the Church Times. The hymn did not receive wide acceptance, however, until Sullivan wrote the tune "St. Gertrude" for it. Sullivan quoted the tune in his Boer War Te Deum, first performed in 1902, after his death. Another hymn sung to the St. Gertrude tune is "Forward Through the Ages", written by Frederick Lucian Hosmer (1840–1929) in 1908.

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https://en.wikipedia.org/wiki/Onward,_Christian_Soldiers