Said to be the oldest fighting system used by ninja, the Gyokko Ryu Ninjutsu is developed from an older fighting system brought over from China and integrated with the Japanese systems of the time. Legend tells of its founder Yo Gyokko using this koshijutsu (the attacking of nerve centres with pinching or striking finger drives) system to defeat several tens of warrior monks lead by an old man of strange appearance who wanted Yo dead because of his reputation in defeating challengers. He killed over fourteen monks and defeated the old man even after being struck on the head by a sword which bounced off, as his head was so hard. Later after killing a lion with one one fist he became known as Koto-ou (lion battling king).
The river that drowns an elephant may be stopped at its source with a twig.