Question 1: The first two sentences refer to the defeat of Xiongnu by Emperor Wu of Han Dynasty; Defended the homeland security, people's life and production of the Han Dynasty.

The second question of the first question: the last two sentences refer to Zhao Jun leaving the fortress; Zhaojun brought peace, tranquility and prosperity to Xiongnu. Later, with the support of the Western Han Dynasty, Uhaanyehe took control of the whole territory of Xiongnu, thus making the Xiongnu and the Han Dynasty reconciled for half a century.

The second question The first question: Huo Qubing, he showed his loyalty to his country and made it his home.

Question 2: Wei Qing, they jointly repelled the Huns and defended the Han Dynasty.

The third question: in the early days, due to the limited national strength of the Han Dynasty, it was unable to wage war again, so it adopted pro-marriage. During the Liang Wudi period, because of its strong national strength, it was able to wage war. In addition, the Huns are still in a slave society, and the Han Dynasty has entered a feudal society, so it is difficult for the old social system to resist the new social system.