At the bottom of this was a fruitful and well-wooded plain, watered by a large river, and from this plain was descried a beautiful garden on the mountain-top, which contained the mansion of Atlantes; but the ring, which discovered what was before invisible, could not, though it revealed this paradise, enable Agramant or his followers to enter it. So steep and smooth was the rock by nature, that even Brunello failed in every attempt to scale it. He did not, for this, despair of accomplishing the object; but, having obtained Agramant's consent, caused the assembled courtiers and knights to celebrate a tournament upon the plain below. This was done with the view of seducing Rogero from his fastness, and the stratagem was attended with success. Rogero joined the tourney, and was presented by Agramant with a splendid horse, Frontino, and a magnificent sword. Having learned from Agramant his intended invasion of France, he gladly consented to join the expedition. Rodomont, meanwhile, was too impatient to wait for Agramant's arrangements, and embarked with all the forces he could raise, made good his landing on the coast of France, and routed the Christians in several encounters. Previously to this, however, Gano, or Ganelon (as he is sometimes called), the traitor, enemy of Orlando and the other nephews of Charlemagne, had entered into a traitorous correspondence with Marsilius, the Saracen king of Spain, whom he invited into France. Marsilius, thus encouraged, led an army across the frontiers, and joined Rodomont. This was the situation of things when Rinaldo and the other knights who had obeyed the summons of Dudon set forward on their return to France. When they arrived at Buda in Hungary they found the king of that country about despatching his son, Ottachiero, with an army to the succor of Charlemagne. Delighted with the arrival of Rinaldo, he placed his son and troops under his command. In due time the army arrived on the frontiers of France, and, united with the troops of Desiderius, king of Lombardy, poured down into Provence. The confederate armies had not marched many days through this gay tract before they heard a crash of drums and trumpets behind the hills, which spoke the conflict between the paynims, led by Rodomont, and the Christian forces. Rinaldo, witnessing from a mountain the prowess of Rodomont, left his troops in charge of his friends, and galloped towards him with his lance in rest. The impulse was irresistible, and Rodomont was unhorsed. But Rinaldo, unwilling to avail himself of his advantage, galloped back to the hill, and having secured Bayard among the baggage, returned to finish the combat on foot.