Yes, here is the legend.
Huangdi's people were then threatened by a tribe under the leadership of Chi You, who was said to have magical powers and had 81 brothers, each having 4 eyes and 8 arms wielding terrible sharp weapons in every hand. Huangdi called upon 8 neighboring tribes to join forces with him and sent the combined army to meet Chi You and his brothers. The two great armies fought for days without a clear winner. Just as Huangdi's army began to turn the tide of battle, Chi You breathed out a thick fog and obscured the sunlight. Huangdi's army fell into disarray and could not find its way out of the battlefield. At this critical moment, Huangdi invented the South Pointing Chariot, and ordered its construction on the battlefield. With the South Pointing Chariot, Huangdi was able to lead his army out of the fog. Chi You then conjured up a heavy storm. Huangdi then called upon the Gods who blew away the storm clouds and cleared the battlefield. Huangdi then was able to defeat Chi You and his tribe once and for all.
With this great victory, Huangdi not only safeguarded his own tribe, but the tribes of his allies. The 9 Tribes joined together as one tribe under the leadership of Huangdi.
