Jujitsu
Jujitsu was introduced into Japan from China many centuries ago. For ages it was a secret art, guarded jealously by the nobility. Now it is known not only throughout Japan but in many other countries. During World War II and thereafter all United States combat troops learned judo, which is similar to jujitsu, as a means of fighting without weapons.
The art of falling without injury is a first principle of jujitsu. Often an expert will fall purposely in order to trap an unwary opponent into a dangerous position. This is called conquering by yielding. In jujitsu matches, the one in danger of injury from an opponent's grip admits defeat by tapping the floor with hand or foot. A fall is not necessary.