http://history.cultural-china.com/en/52H3909H10655.html
It is said that over 4,000 years ago there lived along the Changjiang River (the Yangtze River) and Huanghe River (the Yellow River) valleys many clan tribes. Of them, the Huang, Yan and Chiyou were the most famous. The Huang tribe lived first in the northwestern part of China (now Shaanxi Province), then moved eastward, and remained at last in the mountain valleys in present-day Zhuolu County, Hebei Province. Still, they led a nomadic life. The Yan tribe lived in an area from the Weihe River valley to the middle reaches of the Huanghe River. The Chiyou tribe, also known as "Jiuli" nationality, lived in the eastern part of China (now the area of Shandong and Henan provinces). In their long years of communications, big wars between the three tribes broke out several times in the northern part of today's Hebei.
After the Yan tribe moved from the Weihe River valley to the middle reaches of the Huanghe River, long-drawn-out conflicts between the Yan and Chiyou tribes began. Defeated by the Chiyou tribe, the Yan tribe fled to Zhuolu, Hebei and joined the Huang tribe. Afterwards, the Yan and Huang tribes fought shoulder to shoulder in a big battle against the Chiyou tribe in Zhuolu. The Chiyou tribe was defeated, and Chiyou himself was killed by the victor, the Huang tribe. This is the well-known "Zhuolu Battle" recorded in Chinese history books.
The Chiyou tribe, also known as "Jiuli" nationality, lived in the eastern part of China (now the area of Shandong and Henan provinces). In their long years of communications, big wars between the three tribes broke out several times in the northern part of today's Hebei.
Henan: