Corpus of Electronic Texts Edition
The Wooing of Emer by Cú Chulainn (Author: [unknown])

paragraph 65

He then met a brave youth who made the same welcome to him. They exchanged converse between them. Cuchulaind was asking to know the way to the dun of Scathach. The youth taught him the way across the Plain of Ill-luck which lay before him. On the hither half of the plain the feet of men would stick fast. On the further half the grass would rise and hold them fast on the points of its blades. The youth gave him a wheel and told him to follow its track thence across one-half of the plain. Then he gave him an apple, and told him to follow the ground where the apple would run, and that in such wise he would reach the far end of the plain. Thus Cuchulaind went across the plain. He then proceeded further. The youth had also told him there was a large glen before him, and a single narrow path through it which was full of monsters that had been sent by Forgall to destroy him, and that was his road to the house of Scathach across terrible high strong districts.