The Dragon Banner at the End of Qin

I transmigrated from Earth to the Qin dynasty, during the reign of Hu Hai. My name is Tian Yu. I command an expeditionary force of thirty thousand: twenty thousand heavily armored infantry, six thousand crossbowmen, and four thousand elite cavalry. On the battlefield, I am the sole will of this invincible army, its supreme commander.

With the Chen Sheng and Wu Guang uprising breaking out, Xiang Yu and Liu Bang on the rise, and nobles from the Six States rebelling to restore their kingdoms, what will happen?