I'm Guan Yu, I'll Kill Everyone in the World at the Beginning

[The soul of a graduate student in the Department of History has passed through the desperate situation of Guan Yu] There are 300 remaining soldiers at the beginning, three days to die, and 30,000 enemy troops. Others traveled through time to become emperors, and I traveled through time to be beheaded? Oh. We know the location of your ambush at Lü Meng. I know every move your Sun Quan makes. I know better than you yourself when Cao Pi will usurp the throne. Anyone who wants to kill me, I will kill them all first! Ma Zhong? One slash! Lu Meng? Kneel down and die! Five good generals? Get in line! Starting from today, I will write the name of Martial Saint!