15 Thus the untamed Germanic tribes, so jealous of their freedom that they would submit to no one, undismayed even by the mighty weight of Roman arms, and never remaining for long under their sway, once they were visited by the unarmed heralds of the Gospel, ciocilely yielded to them; they were drawn, stirred and finally penetrated by the beauty and truth of the new doctrine, and at last, embracing the sweet yoke of Jesus Christ, willingly surrendered to Him.
Source: Ecclesiae Fastos (Vatican.va)