You are the eternal protection and salvation of our souls,
arm us with the helmet of hope,
and the shield of your invincible defense.
Help us in all hardships and needs,
and fill us with joy and gladness with those who love you;
through Jesus Christ our Lord.
Amen.
Source: Sarum Rite
Source of this version: http://www.oursanctuary.net/sarum.html
Also found here: Source of this version: Freely modified from Prayers Ancient and Modern
by Mary Wilder Tileston, Boston, Little Brown, 1914, p. 280 #2
Traditional English:
Thou, who art the eternal protection and salvation of our souls, arm us, we entreat Thee, with the helmet of hope, and the shield of Thy invincible defence; that so, helped by Thee in the straits of our necessities, we may be filled with joy and gladness with those who love Thee, through Jesus Christ our Lord.
Graphic: Page from an English Psalter, from Flickr, Walters Art Museum, Public Domain.