The Legion of Mary is an Association of Catholics who,with the sanction of the Church and under the powerful leadership of Mary Immaculate, Mediatrix of all Graces(who is fair as the moon, bright as the sun, and - to satan and his legionaries - terrible as an army set in battle array), have formed themselves into a Legion for service in the warfare which is perpetually waged by the Church against the world and its evil powers.

 

The legionaries hope to render themselves worthy of their great heavenly Queen by their loyalty, virtues, and courage.

 

The Legion of Mary is therefore organised on the model of an army, principally on that of the army of ancient Rome, the terminology of which is adopted also. But the army and the arms of legionaries of Mary are not of this world.​