Modu's Xiongnu Empire aggressively protected and expanded their territory. When their eastern neighbors, the
Donghu, expressed desire to occupy uninhabited land between them, Modu reacted by attacking them. By 208 BCE, the Donghu had been defeated and their remnants split into the
Xianbei and
Wuhuan tribes. Modun went on to subdue the
Dingling and other peoples to the north, and defeat the
Yuezhi in 203 BCE. After these conquests, all Xiongnu lords submitted to him. The Han dynasty sent commoner women falsely labeled as "princesses" and members of the Han imperial family multiple times when they were practicing
heqin marriage alliances with the Xiongnu in order to avoid sending the emperor's daughters. After his Chinese campaign, Modu forced the Yuezhi and the
Wusun to become vassals of the Xiongnu. Lü Zhi was infuriated at the rude proposition, and in a heated court session, her generals advised her to rally an army and exterminate the Xiongnu immediately. As she was about to declare war, an outspoken attendant named
Ji Bu pointed out that the Xiongnu army was much more powerful than the Chinese. At Ji Bu's words, the court immediately fell into a fearful silence. Rethinking her plans, Lü Zhi rejected Modu's proposition humbly, as follows: Your Lordship does not forget our land and writes a letter to us, we fear. I retreat to preserve myself. I'm old and frail, I'm losing hair and teeth, and I struggle to maintain balance when I move. Your Lordship has heard wrongly, you shouldn't defile yourself. Our people did not offend you, and should be pardoned. We've two imperial carriages and eight fine steeds, which we graciously offer to Your Lordship. However she continued implementing the
heqin policy of marrying so called "princesses" to Xiongnu chieftains and paying tribute to the Xiongnu in exchange for peace between both sides. ==Analysis of the Xiongnu's rise==