gain victory with unstained swords
The Chinese idiom, Pinyin is B ī NGB ù w ū R è n, which means that there is no blood left. It's easy to win without fighting. It's from the list of rewards for catching thieves.
The origin of Idioms
Han Yu, Tang Dynasty, wrote in his book on the reward of catching thieves: "Wei De's addition to the war is not a dirty weapon, and Wei Bo and other six states are accepted."
Idiom usage
To win without fighting.
gain victory with unstained swords
no one picks up what 's left by the wayside - dào bù duō yí