Why did the 100-year-long war between the Ming Dynasty and Mongolia start because of a household item? There may be many explanations for the answer to this question, but we can start from this incident and analyze it from different angles. The war between the Ming Dynasty and Mongolia could be traced back to the early Ming Dynasty. At that time, the nomads on the Mongolian steppe often harassed the border of the Ming Dynasty, causing great trouble for the Ming Dynasty. The Ming government launched attacks on Mongolia many times, but they did not achieve good results each time. It was not until the appearance of a household item that it triggered a large-scale war between the Ming Dynasty and Mongolia. This household item was most likely a horse used by a Mongolian noble. Horses were very important weapons in ancient wars because they could run and turn quickly to help the army attack and defend the enemy. The Mongol nobles gradually mastered certain military skills and strategies in the process of using horses and began to launch attacks on the Ming Dynasty. The Ming government realized that the harassment of the Mongol nobles posed a threat to their national security, so they decided to take action. They sent troops to attack Mongolia to protect the country. During this process, the Mongol nobles used the horses provided by the Ming Dynasty, causing a war between the Ming Dynasty and the Mongol Empire. Therefore, from this point of view, the outbreak of war between the Ming Dynasty and Mongolia might not have a direct cause and effect relationship with the appearance of a household item. However, this event did reveal the importance of military technology, strategies, and resources in ancient wars, and also reflected the cultural differences and conflicts between different ethnic groups.