Overview
The siege of Pyongyang was a military conflict fought between the allied Ming-Joseon army and the Japanese First Division under Konishi Yukinaga. The battle ended in victory for the allies but a successful retreat from Pyeongyang by the remaining Japanese in the night of 8 February 1593.
Background
A minor Ming force of 5,000 under Wu Weizhong arrived at the Yalu River on 5 January.
The Ming army of 35,000 under Li Rusong arrived at the Yalu River on 26 January. They were then joined by the advance force and a bodyguard unit sent to protect Seonjo of Joseon, raising their strength to 43,000, another 10,000 Koreans at Sunan under Yi Il, and finally 4,200 monks under Hyujeong.
Li Rusong sent ahead the envoy Shen Weijing to negotiate with Konishi Yukinaga, however this act was insincere. He had no intention of negotiating with the Japanese. Konishi sent 20 men to greet the Ming envoys, but most of them did not return. It's not certain what happened to them. One version of events state that they were killed during a banquet with Shen Weijing, another says they were simply ambushed on the way.
From Wikipedia (CC BY-SA 4.0).