Idiom: An arrogant army will be defeated. Pinyin: iāo bīng bì bài) Explanation: An army that relies on strength and underestimates the enemy. An army that relies on strength and underestimates the enemy will definitely lose the battle. Source: Eastern Han Dynasty·Ban Gu's "Han Shu·Wei Xiang Zhuan" ": "Those who rely on the greatness of the country, are proud of the people, and want to show their power to the enemy are called arrogant soldiers, and those who are arrogant soldiers will be destroyed." The above is for reference!