I Hit the Fast-Forward Button on Civilization

During a mission, modern soldier Yang Fei accidentally transmigrates to the prehistoric era, ten thousand years ago. Watching mammoths and saber-toothed tigers race across the grasslands, he falls into a long silence.

What kind of sparks will fly when he encounters homeless natives? Can the rifle in his hands help them reclaim their home?

Can farming and livestock raising, along with developing new technologies, speed up the progress of human civilization?

What crises will arise when he forms an alliance and sweeps across the lands?