.... So Cu Chulainn asked and he asked, and at length he learned that the best...

.... So Cu Chulainn asked and he asked, and at length he learned that the best teacher of the arts of war was a woman, Scathach, a strange creature who lived on a tiny island off the coast of Alba."
"A woman?" someone echoed scornfully. "How could that be?"
"Ah, well, this was no ordinary woman, as our hero soon found out for himself. When he came to the wild shore of Alba and looked across the raging waters to the island where she lived with her warrior women, he saw that there could be a difficulty before he even set foot there. For the only way across was by means of a high, narrow bridge, just wide enough for one man to walk on. And the instant he set his foot upon its span, the bridge began to shake and flex and bounce up and down, all along its considerable length, so that anyone foolish enough to venture farther along it would straightaway be tossed down onto the knife-sharp rocks or into the boiling surf."
"Why didn't he use a boat?" asked Spider with a perplexed frown.
"Didn't you hear what Liadan said?" Gull responded with derision. "Raging waters? Boiling surf? No boat could have crossed that sea, I'd wager.