The Xiongnu economy rested on the steppe — herds of horses, sheep, and cattle moved across vast pasturelands, supplying meat, milk, wool, hides, and felt for daily life and warfare. Mobility was their wealth: a mounted society that could strike, withdraw, and reassemble faster than any sedentary power.

Yet pastoralism alone could not supply grain, silk, or refined goods. The Xiongnu acquired these through raiding and tribute — pressuring Han China into a marriage-alliance system in which Chinese princesses were sent to the steppe along with annual payments of silk, grain, wine, and gold. When the Han withheld payment, the Xiongnu raided the frontier; when the Han paid generously, peace held.

Under Modu, their first great ruler, the Xiongnu unified the steppe tribes and trapped the founding Han emperor at the Siege of Baideng (200 BCE), forcing China into its first tribute treaty. The relationship reversed a century later under Emperor Wu of Han, whose generals pushed the Xiongnu deep into Mongolia and seized the trade corridor leading west to the Silk Road. Centuries later, branches of these steppe peoples would re-emerge in the West as the Huns of Attila.