At that the fiend which had taken the shape of a horse shook off Sir Percivale and dashed into the water, crying and making great sorrow; and it seemed to him that the water burned. Then Sir Percivale knew that it was not a horse but a fiend which would have brought him to perdition, and he gave thanks and prayed all that night long. As soon as it was day he looked about him, and saw he was in a wild mountain, girt round with the sea and filled with wild beasts. Then he rose and went into a valley, and there he saw a young serpent bring a young lion by the neck, and after that there passed a great lion, crying and roaring after the serpent, and a fierce battle began between them. Sir Percivale thought to help the lion, as he was the more natural beast of the twain, and he drew his sword and set his shield before him, and gave the serpent a deadly buffet. When the lion saw that, he made him all the cheer that a beast might make a man, and fawned about him like a spaniel, and stroked him with his paws. And about noon the lion took his little whelp, and placed him on his back, and bare him home again, and Sir Percivale, being left alone, prayed till he was comforted. But at eventide the lion returned, and couched down at his feet, and all night long he and the lion slept together. [Illustration: SIR PERCIVALE SLAYS THE SERPENT] VI. An Adventure of Sir Lancelot. As Lancelot went his way through the forest he met with many hermits who dwelled therein, and had adventure with the Knight who stole his horse and his helm, and got them back again. And he learned from one of the hermits that Sir Galahad was his son, and that it was he who at the Feast of Pentecost had sat in the Siege Perilous, which it was ordained by Merlin that none should sit in save the best Knight in the world. All that night Sir Lancelot abode with the hermit and laid him to rest, a hair shirt always on his body, and it pricked him sorely, but he bore it meekly and suffered the pain. When the day dawned he bade the hermit farewell. As he rode he came to a fair plain, in which was a great castle set about with tents and pavilions of divers hues. Here were full five hundred Knights riding on horseback, and those near the castle were mounted on black horses with black trappings, and they that were without were on white horses and their trappings white. And the two sides fought together, and Sir Lancelot looked on.