Linked from
The 21 pages that link to Eight Banners, each with the reason it gives.
Qing dynastyBroader topic: Banner garrisons and privileges sustained Manchu power across the empire.
NurhaciBroader topic: Nurhaci formalized the banner system to mobilize and govern his followers.
Later JinRelated: The banner system mobilized Later Jin forces and organized its subjects.
Wu SanguiRelated: The Qing army Wu admitted was organized around this banner system.
Battle of Shanhai PassRelated: Banner armies supplied the Qing forces that fought at Shanhai Pass.