Book X - Chapter LXX - How Sir Tristram changed his harness and it was all red, and how he demeaned him, and how Sir Palomides slew Launcelot's horse.

AND when the queen La Beale Isoud saw that Sir Tristram was unhorsed, and she wist not where he was, then she wept greatly. But Sir Tristram, when he was ready, came dashing lightly into the field, and then La Beale Isoud espied him. And so he did great deeds of arms; with one spear, that was great, Sir Tristram smote down five knights or ever he stint. Then Sir Launcelot espied him readily, that it was Sir Tristram, and then he repented him that he had smitten him down; and so Sir Launcelot went out of the press to repose him and lightly he came again. And now when Sir Tristram came into the press, through his great force he put Sir Palomides upon his horse, and Sir Gareth, and Sir Dinadan, and then they began to do marvellously; but Sir Palomides nor none of his two fellows knew not who had holpen them on horseback again. But ever Sir Tristram was nigh them and succoured them, and they [knew] not him, because he was changed into red armour: and all this while Sir Launcelot was away.

So when La Beale Isoud knew Sir Tristram again upon his horse-back she was passing glad, and then she laughed and made good cheer. And as it happened, Sir Palomides looked up toward her where she lay in the window, and he espied how she laughed; and therewith he took such a rejoicing that he smote down, what with his spear and with his sword, all that ever he met; for through the sight of her he was so enamoured in her love that he seemed at that time, that an both Sir Tristram and Sir Launcelot had been both against him they should have won no worship of him; and in his heart, as the book saith, Sir Palomides wished that with his worship he might have ado with Sir Tristram before all men, because of La Beale Isoud. Then Sir Palomides began to double his strength, and he did so marvellously that all men had wonder of him, and ever he cast up his eye unto La Beale Isoud. And when he saw her make such cheer he fared like a lion, that there might no man withstand him; and then Sir Tristram beheld him, how that Sir Palomides bestirred him; and then he said unto Sir Dinadan: So God me help, Sir Palomides is a passing good knight and a well enduring, but such deeds saw I him never do, nor never heard I tell that ever he did so much in one day. It is his day, said Dinadan; and he would say no more unto Sir Tristram; but to himself he said: An if ye knew for whose love he doth all those deeds of arms, soon would Sir Tristram abate his courage. Alas, said Sir Tristram, that Sir Palomides is not christened. So said King Arthur, and so said all those that beheld him. Then all people gave him the prize, as for the best knight that day, that he passed Sir Launcelot outher Sir Tristram. Well, said Dinadan to himself, all this worship that Sir Palomides hath here this day he may thank the Queen Isoud, for had she been away this day Sir Palomides had not gotten the prize this day.

Right so came into the field Sir Launcelot du Lake, and saw and heard the noise and cry and the great worship that Sir Palomides had. He dressed him against Sir Palomides, with a great mighty spear and a long, and thought to smite him down. And when Sir Palomides saw Sir Launcelot come upon him so fast, he ran upon Sir Launcelot as fast with his sword as he might; and as Sir Launcelot should have stricken him he smote his spear aside, and smote it a-two with his sword. And Sir Palomides rushed unto Sir Launcelot, and thought to have put him to a shame; and with his sword he smote his horse's neck that Sir Launcelot rode upon, and then Sir Launcelot fell to the earth. Then was the cry huge and great: See how Sir Palomides the Saracen hath smitten down Sir Launcelot's horse. Right then were there many knights wroth with Sir Palomides because he had done that deed; therefore many knights held there against that it was unknightly done in a tournament to kill an horse wilfully, but that it had been done in plain battle, life for life.