rén chén wō luàn
Imjin war, Japanese invasion of Korea 1592-1598
壬
rén
ninth of the ten Heavenly Stems 十天干[shi2 tian1 gan1]
辰
chén
5th earthly branch: 7-9 a.m., 3rd solar month (5th April-4th May), year of the Dragon
倭
wō
dwarf
乱
luàn
in confusion or disorder