Then Sir Dinadan told Sir Gareth how that knight in the black harness was Sir Tristram: And this is Launcelot that fighteth with him, that must needs have the better of him, for Sir Tristram hath had too much travail this day. Then let us smite him down, said Sir Gareth. So it is better that we do, said Sir Dinadan, than Sir Tristram be shamed, for yonder hoveth the strong knight with the silver shield to fall upon Sir Tristram if need be. Then forthwithal Gareth rushed upon Sir Launcelot, and gave him a great stroke upon his helm so hard that he was astonied. And then came Sir Dinadan with a spear, and he smote Sir Launcelot such a buffet that horse and all fell to the earth. O Jesu, said Sir Tristram to Sir Gareth and Sir Dinadan, fie for shame, why did ye smite down so good a knight as he is, and namely when I had ado with him? now ye do yourself great shame, and him no disworship; for I held him reasonable hot, though ye had not holpen me.