On his way back, he marched with his whole army through the gorges of the mountains by way of the valleys of Engui, Eno, and Roncesvalles. The chief of this region had waited upon Charlemagne, on his advance, as a faithful vassal of the monarchy; but now, on the return of the Franks, he had called together all the wild mountaineers who acknowledged him as their chief, and they occupied the heights of the mountains under which the army had to pass. The main body of the troops met with no obstruction, and received no intimation of danger; but the rear-guard, which was considerably behind, and encumbered with its plunder, was overwhelmed by the mountaineers in the pass of Roncesvalles, and slain to a man. Some of the bravest of the Frankish chiefs perished on this occasion, among whom is mentioned Roland or Orlando, governor of the marches or frontier of Brittany. His name became famous in after times, and the disaster of Roncesvalles and death of Roland became eventually the most celebrated episode in the vast cycle of romance. Though after this there were hostile encounters between the armies of Charlemagne and the Saracens, they were of small account, and generally on the soil of Spain. Thus the historical foundation for the stories of the romancers is but scanty, unless we suppose the events of an earlier and of a later age to be incorporated with those of Charlemagne's own time. There is, however, a pretended history, which for a long time was admitted as authentic, and attributed to Turpin, Archbishop of Rheims, a real personage of the time of Charlemagne. Its title is "History of Charles the Great and Orlando." It is now unhesitatingly considered as a collection of popular traditions, produced by some credulous and unscrupulous monk, who thought to give dignity to his romance by ascribing its authorship to a well-known and eminent individual. It introduces its pretended author, Bishop Turpin, in this manner: "Turpin, Archbishop of Rheims, the friend and secretary of Charles the Great, excellently skilled in sacred and profane literature, of a genius equally adapted to prose and verse, the advocate of the poor, beloved of God in his life and conversation, who often fought the Saracens, hand to hand, by the Emperor's side, he relates the acts of Charles the Great in one book, and flourished under Charles and his son Louis, to the year of our Lord eight hundred and thirty." The titles of some of Archbishop Turpin's chapters will show the nature of his history. They are these: "Of the Walls of Pampeluna, that fell of themselves." "Of the War of the holy Facundus, where the Spears grew." (Certain of the Christians fixed their spears in the evening, erect in the ground, before the castle; and found them, in the morning, covered with bark and branches.) "How the Sun stood still for Three Days, and of the Slaughter of Four Thousand Saracens."