22 And what will Christ say to you afterwards? Do you not remember what He said by the prophet Nathan to holy David? “I have chosen you the youngest of your brethren, and from a private man have made you emperor. I have placed of the fruit of your seed on the imperial throne. I have made barbarous nations subject unto you, I have given you peace, I have delivered your enemy captive into your power. You had no grain for provision for your army, I opened to you the gates, I opened to you their stores by the hand of the enemies themselves.
Your enemies gave to you their provisions which they had prepared for themselves. I troubled the counsels of your enemy, so that he made himself bare. I so fettered the usurper of the empire himself and bound his mind, that while he still had means of escape, yet with all belonging to him, as though for fear lest any should escape you, he shut himself in. His officer and forces on the other element, whom before I had scattered, that they might not join to fight against you, I brought together again to complete your victory.
Your army, gathered together from many unsubdued nations, I bade keep faith, tranquillity, and concord as if of one nation. When there was the greatest danger lest the perfidious designs of the barbarians should penetrate the Alps, I conferred victory on you within the very wall of the Alps, that you might conquer without loss. Thus, then, I caused you to triumph over your enemy, and you give My enemies a triumph over My people.”
Source: Letters (New Advent)