This chapter discusses the two wars between Great Britain and the Qing Empire in 1839–1842 and 1856–1860. Usually viewed separately it makes sense to consider the two together. Both conflicts were about two sets of concerns: First, the British wanted a framework where British merchants had access to multiple ports, limited taxes, no restrictions on who they could trade with, and legalized imports of opium. Second, the British wanted a new system of diplomatic and political relations.Rejecting existing Qing systems of diplomatic relations such as the tribute system, the British wanted to utilize European diplomatic practices and international law as an institutional framework. Victory in both wars allowed Britain to redefine the frameworks of both trade and diplomacy in the manner they saw fit, creating the treaty system that would last until World War II.