Saint Germanus and St. Lupus not only preached with such power as to astonish and to convince whole congregations, too large for any building to contain, but they gave sight to the blind, cast out devils, and raised the dead. St. Germanus was even induced to assist the faithful in the way of his original profession; for a Pagan army of Northmen and Picts invading the Christian provinces, the saint took the command of such persons as he found willing to defend their country, and having selected a place suited to his purpose, either by naturally possessing an echo, or by receiving it miraculously from his prayers, he there awaited the enemy, and on their approach shouting three times ALLELUIAH, and the whole army joining with their utmost might, the divine sounds, repeated and enforced by the reverberation on all sides, so terrified the assailants as to drive them into immediate flight, with the casting away of their arms, who were, in consequence, readily and safely pursued with great slaughter, through the whole space separating them from their fleet, none being spared but such as had the grace instantly to acquiesce in a method of conversion so clear, so powerful, and so coercive. St. Germanus and St. Lupus soon afterwards left Britain, in the full confidence of having suppressed the heresy; but so obstinate and perverse were the people, that it broke out with increased violence, the circumstance of Pelagius being their countryman having probably more weight with the inhabitants than the arguments on either side, as in modern times all German Protestants are followers of Luther, as those of France are invariably of Calvin.