First, you can't play good cards.
This is the land machine of Jin Dynasty. Lu Ji was born in three generations of military strategists, and his ancestors were Lu Xun, a famous soldier from the Three Kingdoms. He liked Sun Tzu's Art of War and annotated it, so he was a famous strategist at that time. However, when he was entrusted with a heavy responsibility, his performance surprised everyone. During the Eight Kings Rebellion, he commanded more than 200,000 troops of Sima Ying and was defeated in World War I. In his own army, he dared not enforce the law against his subordinates, but was falsely accused of rebellion and killed by his subordinates. Lu Ji belongs to a theorist who can't lead troops, even if he has superior troops, he can't use it.
Second, get carried away and be exploited.
In the battle of Kunyang, Wang Mang's army had 430,000 men, which was against Liu Xiu's 89,000 men. At this time, Liu Xiu put all his eggs in one basket and led the whole army to attack the central part of Wang Mang's army. Liu Xiuchong rushed to the front line and personally killed dozens of enemies. Encouraged by Liu Xiu, his men also fought bravely.
But his enemies, Wang Xun and Wang Yi, the leaders of Wang Mang's army, wanted to take the credit for themselves. They ordered other troops not to move, and led the same troops to fight Liu Xiu alone, and the result was defeated. The fall of the Lord caused the remnants of Wang Mang's army to fall apart and almost all the troops were wiped out.
Fu Jian in the Battle of Feishui also encountered a similar situation. Fu Jian led more than 800,000 soldiers and horses to attack the Eastern Jin Dynasty. Regardless of internal instability and war-weariness, he was defeated by 80,000 troops in the Eastern Jin Dynasty at Feishui, and he was afraid of being frightened. Then Fu Jian's territory rebelled, and the former Qin Dynasty soon perished.
Third, in case of natural and man-made disasters, the card was lost.
During the Republic of China, Guangdong warlord Chen opposed Chiang Kai-shek. Chen had the most powerful air force in China at that time, which was his military trump card. At that time, Chen Zheng prepared to fight against Chiang Kai-shek. He asked the counselor, who calculated a divination and said? Now or forever? .
So Chen Fa moved against Chiang Kai-shek. Who knew Chiang Kai-shek was ready? He vowed to be an official, launched a silver bullet offensive, and held Chen's air force in his hands. Chen's hundreds of planes all defected to Chiang Kai-shek in just a few days.
Chen had to ask the counselor again. The counselor said it's now or never. Now the plane is gone and the tide is gone. Chen was forced to step down and lost everything.
Therefore, holding a good hand and finally breaking it are generally the above three reasons.