[2] His aim in subjugating Korea was probably to make himself ruler of that country, but he was opposed by the other princes who had been sent as his assistants, including his own brother, Jirgalang, and his nephews, Dudu and Yoto.
When these princes signed separately a treaty with the Korean king, Amin was so angry that he set his troops in Pyongyang free for three days of pillaging.
Upon his arrival at Mukden in July 1630, Amin was arrested and tried for fleeing from his post, disobeying orders, for not having confronted the enemy in a single engagement, for losing many of his troops, and for other misdemeanors.
[4] A council of princes and high officials condemned him to death on sixteen counts, but Hong Taiji intervened and commuted his sentence to incarceration.
However the elimination of Amin as one of the Four Senior Beile made it easier for Hong Taiji to reduce the power of Manggūltai in 1631 and to appropriate for himself the latter's Plain Blue Banner.