No sooner had Palamides espied this stranger than he put his spear in rest and rode against him at furious speed. But there came a sudden change in his fortunes, for the white knight struck him with such force as to hurl him from his horse to the ground.
Then there arose a great noise and uproar among the people, for they had grown to think that no knight could face the Saracen, and Gawaine and others whom he had overthrown marvelled who this stranger knight could be. But Isolde was glad at heart, for the love of Palamides was a burden to her, and well she knew the knight of the white arms.
As for the Palamides, he was so ashamed and disconcerted by his fall that, on mounting his horse again, he sought privately to withdraw from the field. But the white knight rode hastily after him and bade him turn, saying that he should not leave the lists so lightly. At these words Palamides turned and struck a fierce sword-blow at the white champion. But the latter put the stroke aside, and returned it with so mighty a buffet on the Saracen's head that he fell from his horse to the earth.
Then Tristram--for he was the white knight--bade him yield and consent to do his command, or he would slay him. To this Palamides agreed, for he was hurt past defence.
"This, then, is my command," said Tristram. "First, upon pain of your life, you shall cease your suit of the lady La Belle Isolde, and come not near her. Second, for a year and a day you shall wear no armor or weapons of war. Promise me this, or you shall die."
"This is a bitter penance," cried Palamides. "You shame me before the world. For nothing less than life would I consent."
But he took the oath as Tristram commanded, and then in anger and despite threw off his armor and cut it into pieces, flinging the fragments away. Then he departed, weighed down with sadness and shame.
This done, Tristram left the lists, where he could find no knight willing to fight with him, and rode to the private postern of the castle whence he had come to the field. Here he found the fair Isolde awaiting him with a joyous face and a voice of thanks, praising him so highly that the knight was abashed with modest shame, though gladness filled his heart. And when she had told the king and queen that it was Tramtrist who had vanquished the Saracen, they treated him as if he had been of royal blood, for he had shown such prowess as Lancelot himself could not exceed.