Then he armed him lightly, and gat his horse, and rode after Sir Tristram that rode straightway unto Tintagil. And within a while he overtook Sir Tristram, and then he bade him, Turn, false traitor knight. And Sir Tristram anon turned him against him. And therewithal Segwarides smote Sir Tristram with a spear that it all to-brast; and then he swang out his sword and smote fast at Sir Tristram. Sir knight, said Sir Tristram, I counsel you that ye smite no more, howbeit for the wrongs that I have done you I will forbear you as long as I may. Nay, said Segwarides, that shall not be, for either thou shalt die or I.

Then Sir Tristram drew out his sword, and hurtled his horse unto him fiercely, and through the waist of the body he smote Sir Segwarides that he fell to the earth in a swoon. And so Sir Tristram departed and left him there. And so he rode unto Tintagil and took his lodging secretly, for he would not be known that he was hurt.

Malory's Le Morte d'Arthur