At the Beginning, He Became Qin Shubao and Almost Died with One Sword.

[Time travel + no system + cool writing + tactics + generals] Qin Tian, a history student, opened his eyes and became Qin Qiong, a hero of the Sui and Tang Dynasties. So he established a foothold in Wagang, killed Li Mi, conquered Li Erlang, created a brocade guard, a firearms camp, and built an arsenal. My Xuanwu fighter planes are ready to go... See how Qin Tian pushes all the way, conquers the world, and creates an immortal and prosperous age!