During the Five Dynasties period, the last dynasty was the Later Zhou.
During the Later Zhou Dynasty, Emperor Guo Wei, originally a military governor stationed in Weizhou, had an excellent relationship with his supervisor Wang Jun. Wang Jun was two years older, so Guo Wei called him "elder brother" and followed his advice without question.
During the Later Han Dynasty, Emperor Yin, seeking to eliminate rivals, sent assassins to Weizhou to kill Guo Wei and Wang Jun. Forced into rebellion, the two used military strategy and cunning to seize power—Guo Wei became Emperor Taizu of Later Zhou, while Wang Jun rose to a powerful minister with real authority.
Shortly after Emperor Taizu of the Later Zhou ascended the throne, Liu Min, the former Hedong military governor of the Later Han, launched an attack on Jinzhou to expand his territory. The emperor dispatched General Wang Jun to suppress the rebellion. Upon reaching Shanzhou, Wang Jun ordered his troops to halt and rest—a pause that stretched over ten days. Growing anxious, Emperor Taizu sent his envoy Zhai Shousu racing at breakneck speed to Shanzhou, where Zhai delivered the emperor's message: "Why delay when the enemy is at our gates?"
“If you remain inactive any longer, the Grand Ancestor will personally lead the expedition.”
Upon hearing this, Wang Jun dismissed those around him and quietly said to Zhai Shousu:
“What’s the hurry?” the general replied calmly. “Jinzhou’s defenses are solid; Liu Min won’t break through. His army charges like a storm—too sharp to meet head-on. I’m staying here not out of fear, but to dodge their edge, watch the situation, and strike back when the time’s right. Besides, the new emperor has just taken the throne and hasn’t secured his footing yet. He should first win over the regional governors with authority and grace. Go back and tell His Majesty: from what I’ve seen, the governor of Yanzhou, Murong Yanchao, is already showing signs of rebellion. If the emperor leaves the capital on campaign, and Murong Yanchao storms the palace—what a disaster that would be!”
When Emperor Taizu of Later Zhou received the messenger's report, he suddenly realized that Wang Jun's wisdom was truly extraordinary and his loyalty unwavering, so from then on he treated him with even greater respect and favor.
After sending off the envoy Zhai Shousu, Wang Jun ordered his army to advance toward Jinzhou, setting up camp thirty li away. When Liu Min heard that the undefeated general Wang Jun was leading the campaign, fear gripped him, and he quietly withdrew his forces.
However, Wang Jun later grew arrogant, taking credit for his achievements and becoming increasingly overbearing. This finally pushed Emperor Taizu of Later Zhou beyond endurance, who demoted him to the post of Sima of Shangzhou, where Wang Jun ultimately died.
Later, the idiom "Too Sharp to Be Stopped" came to describe an unstoppable, overwhelming force.
Source: *New History of the Five Dynasties*, "Biography of Wang Jun"
Meaning of the Idiom: Later, the Chinese idiom "锐不可当" came to describe an unstoppable, overwhelming force.