re <<The  Chinese, as far as I can see in their  history, are not a war-like,  winner-takes-all, people. They have a  history of learning, trading and  peaceful co-existence.>>
  Well there was that time when China spent over 200 years fighting the Xiongnu horse nomads and expanding westward...  
  Han–Xiongnu War en.wikipedia.org
  War of the Heavenly Horses en.wikipedia.org
  The War of the Heavenly Horses (simplified Chinese: ????; traditional Chinese: ????; pinyin: Tianma zhi Zhàn) or the Han–Dayuan War (simplified Chinese: ????; traditional Chinese: ????; pinyin: Hàn Yuan Zhànzheng) was a military conflict fought in 104 BC and 102 BC between the Chinese Han dynasty and the Saka-ruled (Scythian) Greco-Bactrian kingdom known to the Chinese as Dayuan, in the Ferghana Valley at the easternmost end of the former Persian Empire (between modern-day Uzbekistan, Kyrgyzstan and Tajikistan). The war was allegedly instigated by trade disputes compounded by the extended geopolitics surrounding the Han-Xiongnu War, resulting in two Han expeditions that eventuated in a Han victory, allowing Han China to expand its hegemony deep into Central Asia (then known to the Chinese as the Western Regions).[1][2]
  Emperor Wu of Han had received reports from diplomat Zhang Qian that Dayuan owned fast and powerful Ferghana horses known as the "heavenly horses", which would help greatly with improving the quality of their cavalry mounts when fighting the Xiongnu horse nomads, so he sent envoys to survey the region and establish trade routes to import these horses. However, the Dayuan king not only refused the deal, but also confiscated the payment gold, and had the Han ambassadors ambushed and killed on their way home. Humiliated and enraged, the Han court sent an army led by General Li Guangli to subdue Dayuan, but their first incursion was poorly organized and undersupplied. A second, larger and much better provisioned expedition was sent two years later and successfully laid siege to the Dayuan capital at Alexandria Eschate, and forced Dayuan to surrender unconditionally. The Han expeditionary forces installed a pro-Han regime in Dayuan and took back enough horses to improve Han's horse breeding.[3] This power projection also forced many smaller Tocharian oasis city-states in the Western Regions to switch their alliance from Xiongnu to the Han dynasty, which paved the way for the later establishment of the Protectorate of the Western Regions. |