During the Anti-Japanese War, I Have 20,000 People Per Battalion.

Yan Sanying traveled back in time to the Anti-Japanese War and became a battalion commander of the Eighth Route Army. With independent development, he continued to kill Japanese, puppet troops, and bandits while recruiting troops. The team grew rapidly and soon reached 20,000 people. When the regiment leader came one day and heard Yan Sanying say that a battalion had 20,000 people, everyone else became numb. What happened, he became a division commander?