Jurchen script
A century after the chaos started in the Jurchen lands, Nurhaci, a chieftain of the Jianzhou Left Guard, began a campaign against the Ming Empire in revenge for their manslaughter of his grandfather and father in 1583. He reunified the Jurchen tribes, established a military system called the "Eight Banners", which organized Jurchen soldiers into groups of "Bannermen", and ordered his scholar Erdeni and minister Gagai to create a new Jurchen script (later known as Manchu script) using the traditional Mongolian alphabet as a reference.