Yue was a naval power. It’s logistics like prevention of seasickness or tropical diseases. Here’s an example. https://en.wikipedia.org/wiki/Battle_of_Red_Cliff

Yue was a naval power. It’s logistics like prevention of seasickness or tropical diseases. Here’s an example. https://en.wikipedia.org/wiki/Battle_of_Red_Cliffs https://en.wikipedia.org/wiki/Battle_of_Red_Cliffs >Cao Cao had chained his ships from stem to stern, possibly with the aim of reducing seasickness in his navy, which was composed mostly of northerners who were not used to living on ships. Observing that, the divisional commander Huang Gai sent Cao Cao a letter feigning surrender and prepared a squadron of capital ships described as mengchong doujian (蒙衝鬥艦). The ships had been converted into fire ships by filling them with bundles of kindling, dry reeds, and fatty oil. As Huang Gai's "defecting" squadron approached the midpoint of the river, the sailors applied fire to the ships before they took to small boats. The unmanned fire ships, carried by the southeastern wind, sped towards Cao Cao's fleet and set it ablaze. Many men and horses either burned to death or drowned. Mongolians did not like the weather of the south in China as well so their forces an DNA are much less common in the south. The use of optics in Europe also allowed them to see and prepare for ambushes, invasion and spying from far distances. The best modern example is keyhole: a Hubble space telescope designed for high resolution worldwide orbital scanning. Africa was also not colonized without the aid of vaccines that killed Europeans and genetic mutations like sickle cell prevented the local populations from malaria.