How Sir Launcelot and Sir Gawaine did battle together, and how Sir Gawaine was overthrown and hurt. Then Sir Gawaine and Sir Launcelot departed a great way asunder, and then they came together with all their horses’ might as they might run, and either smote other in midst of their shields; but the knights were so strong, and their spears so big, that their horses might not endure their buffets, and so their horses fell to the earth; and then they avoided their horses, and dressed their shields afore them. Then they stood together and gave many sad strokes on divers places of their bodies, that the blood brast out on many sides and places. Then had Sir Gawaine such a grace and gift that an holy man had given to him, that every day in the year, from underne till high noon, his might increased those three hours as much as thrice his strength, and that caused Sir Gawaine to win great honour. And for his sake King Arthur made an ordinance, that all manner of battles for any quarrels that should be done afore King Arthur should begin at underne; and all was done for Sir Gawaine’s love, that by likelihood, if Sir Gawaine were on the one part, he should have the better in battle while his strength endureth three hours; but there were but few knights that time living that knew this advantage that Sir Gawaine had, but King Arthur all only.
Thus Sir Launcelot fought with Sir Gawaine, and when Sir Launcelot felt his might evermore increase, Sir Launcelot wondered and dread him sore to be shamed. For as the French book saith, Sir Launcelot weened, when he felt Sir Gawaine double his strength, that he had been a fiend and none earthly man; w............