The siege of Lüshun was a military conflict between the Later Jin and Ming dynasty.
In the summer of 1634 the Jin attacked and conquered the port city of Lüshun from Ming.
In the spring of 1633 the ex-Ming commanders Kong Youde and Geng Zhongming defected to the Jin after their rebellion was suppressed by Ming forces.
Seeing that defeat was imminent, its commander Huang Long sent a messenger with his seals of office back to Beijing.
[1] The Jin left 2,500 men to garrison Lüshun and it was used as the base of operations for mopping up Ming remnants in the Bohai Sea.