Corpus of Electronic Texts Edition
The Training of Cúchulainn (Author: unknown)

section 22

Touching Cúchulainn; he began slipping and falling on the back of the bridge, so that he afterwards leapt to earth and full ground. And the three chief scholars of the world uttered a shout and many cries of scorn and mockery at him for the greatness of his folly in going to practise that lesson without having been taught by Scáthach. Thereby Cúchulainn was enraged, and he leapt aloft hoveringly, accompanying the wind, so that from that mad leap he came standing on the floor of the bridge, that is, on the middle pillar of the bridge. And the bridge was not narrowed or sharpened or made slippery under him.