If you don’t already know this hymn, the first thing you’re going to think is, “Hey, that’s Onward, Christian Soldiers!” Actually it’s Christ Shall Have Dominion, but you’re right about one thing–the music is exactly the same. And that’s because the melody used in both hymns was composed by the same man–Arthur S. Sullivan, of Gilbert and Sullivan fame.
You might want to turn up the volume on this one. And pray: O Lord Our God, we long for the day when this your promise is fulfilled, and Christ reigns over all Creation!