Then, at the Emperor's command, his trumpeters sounded their trumpets so defiantly that the very earth trembled and shook; and the two hosts joined battle, rushing at one another with mighty shouts. Many knights fought nobly that day, but none more nobly than King Arthur. Riding up and down the battle-field, he exhorted his knights to bear themselves bravely; and wherever the fray was thickest, and his people most sorely pressed, he dashed to the rescue and hewed down the Romans with his good sword Excalibur. Among those he slew was a marvelous great giant called Galapus. First of all, King Arthur smote off this giant's legs by the knees, saying that made him a more convenient size to deal with, and then he smote off his head. Such was the hugeness of the body of Galapus, that, as it fell, it crushed six Saracens to death.
But though King Arthur fought thus fiercely, and Sir Gawaine and all the other knights of the Round Table did nobly, the host of their enemies was so great that it seemed as if the battle would never come to an end, the Britons having the advantage at one moment and the Romans at another.
Now, among the Romans, no man fought more bravely than the Emperor Lucius. King Arthur, spying the marvelous feats of arms he performed, rode up and challenged him to a single combat. They exchanged many a mighty blow, and at last Lucius struck King Arthur across the face, and inflicted a grievous wound. Feeling the smart of it, King Arthur dealt back such a stroke that his sword Excalibur clove the Emperor's helmet in half, and splitting his skull, passed right down to his breast-bone.
Thus Lucius, the Emperor of the Romans, lost his life; and when it was known that he was slain, his whole army turned and fled, and King Arthur and his knights chased them, slaying all they could overtake. Of the host that followed Lucius, more than a hundred thousand men fell that day.
King Arthur, after he had won the great battle in which the Emperor Lucius was slain, marched into Lorraine, and so on through Brabant and Flanders into Germany, and across the mountains into Lombardy, and thence into Tuscany, and at last came to Rome, and on Christmas Day he was crowned emperor by the Pope with great state and solemnity. And he stayed in Rome a little while, setting in order the affairs of his possession, and distributing among his knights posts of honor and dignity, and also great estates, as rewards for their services.
After these affairs had been duly arranged, all the British lords and knights assembled in the presence of the King, and said to him:
"Noble Emperor, now that, Heaven be thanked for it, this great war is over, and your enemies so utterly vanquished that henceforward, as we believe, no man, however great or mighty he may be, will dare to stand up against you, we beseech you to grant us leave to return to our wives and our homes, that there we may rest ourselves."
This request King Arthur granted, saying that it would be wise, seeing they had met with such good fortune so far, to be content with it and to return home. Also he gave orders that there should be no plundering or pillaging of the country through which they had to pass on their way back, but that they should, on pain of death, pay the full price for victuals or whatever else they took.
So King Arthur and his host set off from Rome and came over the sea and landed at Sandwich, where Queen Guinevere came to meet her lord. And at Sandwich and throughout the land there were great festivities, and noble gifts were presented to the King; for his people rejoiced mightily both because he had returned safely home, and because of the great victories he had achieved.