This interesting episode concluded, Federigo rejoined his army, and after accumulating vast booty from the villages, and carrying several fastnesses, dictated terms to the important city of Aquila. Thus passed the summer, and in October he was instructed to bring to obedience the Duke of Sora, who had thrown off allegiance to Ferdinand. Before attacking the town of that name he found it necessary to reduce the mountain fortress of Castelluccio, near the Garigliano; but its tiny garrison, availing themselves of a strong position, held out against the defective artillery of that day until a large force had assembled for its relief. These, however, met from him so warm a reception that they were glad to retire, and leave not only the place but all the duchy of Sora at his mercy. This service was most grateful to Pius, who gladly saw an enemy on his very frontier brought to terms. In the next consistory he remarked that "this captain of ours with his single eye sees everything," and addressed to him the following complimentary brief, which Muzio has preserved. "To our well-beloved son, health and apostolic benediction: We have been duly informed of the courage wherewith you have met the enemy, and in how short a time you have carried the stronghold you were beleaguering. These marvellous exploits content us much, and are worthy of your wonted prowess and magnanimity. Dear to us is your person, and we would cherish your worth and valour. Proceed as you have commenced, and daily add to your good offices in behalf of ourselves and of his Majesty: let it be your endeavour by every exertion to augment your reputation, and you shall always be the son of our benediction. From Rome, at St. Peter's, under the fisher's ring, this 1st of October, 1461, in the eighth year of our pontificate."