Time Travel: Am I a Useless General?

My name is Yun Chen, a courier. However, I am a military fan. It can be said that I am familiar with military books, but it still cannot change the reality that I am a courier. Until one day, I had a car accident and traveled to the Tang Dynasty! The most bloody thing is that I traveled to the battlefield against the Turks. Fortunately, I activated the system on the battlefield. As long as I killed the enemy generals, I could get random rewards. I relied on the system to win all the way. After my master returned to the court... I was still engaged! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.