This is the kind of hymn that makes simpering liberal go-along-to-get-along churchmen cringe: The Son of God Goes Forth to War: written in 1812 by Reginald Heber, sung here by Joe Stout. It can also be sung to the tune of The Minstrel Boy.
Let’s not forget that Jesus Christ is King of kings, whose right it is to rule. And the sooner He claims it and establishes His throne, the better.