§ Of Beren and Lúthien The Silmarillion

Even as they spoke together of these things, walking without heed of aught else, Celegorm and Curufin rode up, hastening through the forest; and the brothers espied them and knew them for afar. Then Celegorm turned his horse, and spurred it upon Beren, purposing to ride him down; but Curufin swerving stooped and lifted Lúthien to his saddle, for he was a strong and cunning horseman. Then Beren sprang from before Celegorm full upon the speeding horse of Curufin that had passed him; and the Leap of Beren is renowned among Men and Elves. He took Curufin by the throat from behind, and hurled him backward, and they fell to the ground together. The horse reared and fell, but Lúthien was flung aside, and lay upon the grass.