Empire's Summoning Generals System

Guan Yu: "If the general doesn't give up, Guan is willing to follow the general and punish the thieves for the general!"
"Okay!" Liu De was overjoyed, and said to Guan Yu, "I have Yunchang, and I am like a tiger with wings!"...
This is a story of a young man with a system in his hand, leading his subordinates and generals to fight on the battlefield and pacify the troubled times in all directions. There is tenderness, iron blood, and the character of the protagonist is gradually becoming cold-blooded in the constant killing.