One of my favorite hymns for Reformation:

Lord, keep us steadfast in Thy Word;

Curb those who fain by craft and sword

Would wrest the kingdom from Thy Son

And set at naught all He hath done.

Lord Jesus Christ, Thy pow’r make known,

For Thou art Lord of lords alone;

Defend Thy Christendom that we

May evermore sing praise to Thee.

O Comforter of priceless worth,

Send peace and unity on earth.

Support us in our final strife

And lead us out of death to life.