The treaty-port system gave foreign navies a presence meant partly to discipline their own merchant crews and protect commerce. Its legal ancestry lay in the 1842 Treaty of Nanking and an 1844 supplementary agreement that regularized trade at the opened ports. Yet intervention ashore remained a last resort: officers needed evidence of uncontrolled violence and a real danger to British lives or property. They normally followed consular or diplomatic advice and could act independently only when no such authority was present. Assistance might initially mean asylum aboard a warship or boats to evacuate endangered people rather than an armed landing. These restrictions explain why identifying pirates and establishing a clear British interest mattered before force could be used.
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Treaty-port authority imposed strict landing rules
Nineteenth-century treaty rights placed warships at Chinese ports, but interwar rules allowed landing parties only for exceptional, immediate threats to British lives and property.