Who is on the Lord's Side

There's a really beautiful hymn from my Protestant days that I find myself singing quite a bit. If you get the opportunity to learn it, you should. It's powerful and meditative:

Who is on the Lord’s side? Who will serve the King?
Who will be His helpers, other lives to bring?
Who will leave the world’s side? Who will face the foe?
Who is on the Lord’s side? Who for Him will go?
By Thy call of mercy, by Thy grace divine,
We are on the Lord’s side—Savior, we are Thine!

Here's a website that has MIDI files for the melody.