A. General Yi knew that the Ming dynasty was more powerful than Mongols were and judged that if he attacked, the Ming would likely invade Korea.
B. Upon his arrival in Kaesŏng, General Yi toppled the government through a military coup and in 1392 CE, he placed himself on the throne —ushering in the Chosŏn Kingdom.
C. Due to his prominence in 1388 CE, the anti-Ming (pro-Mongol) faction sent General Yi to expel a contingent of Ming troops stationed on the northern part of the Korean Peninsula.
D. Seeing the campaign as a potential disaster, General Yi turned his troops south towards the Koryŏ capital, Kaesŏng.