 
 <prompt> Wetin figure bin dey important to the defeat of the Han? Based on di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: The Xiongnu, wey be nomadic steppe confederation, beat Han for 200 BC and make Han submit as inferior partner, but dem still dey raid Han borders. Emperor Wu of Han (r. 141–87 BC) launch plenty military campaigns against dem. The final Han victory for these wars eventually make Xiongnu gree to be Han tributaries. These campaigns expand Han control reach Tarim Basin for Central Asia, divide Xiongnu into two separate confederations, and help establish the big trade network wey dem call Silk Road, wey reach as far as Mediterranean world. The territories wey dey north of Han's borders quick quick fall into hands of nomadic Xianbei confederation. Emperor Wu also launch successful military missions for south, annex Nanyue for 111 BC and Dian for 109 BC, and for Korean Peninsula where Xuantu and Lelang Commanderies dey established for 108 BC. 