Late Ming Dynasty: the Fourth Natural Disaster

In 1644 AD, on March 17, the 17th year of Chongzhen, Li Zicheng's 600,000 Dashun army broke through the outer city of Beijing, and the inner city was in danger. Emperor Chongzhen awaits death in despair, and the last moment of the Ming Dynasty is approaching. At this moment, a thousand "players" from the modern world were sent to Xiyuan, Beijing by the system. Each person brings 50 system soldiers (you can choose the types of soldiers: archers, crossbowmen, gunmen, spearmen, sword and shield soldiers, light cavalry, heavy cavalry, heavy infantry, and scouts). System soldiers do not need food and grass, are sleepless, and are absolutely loyal. The player himself is immortal and can be resurrected at no cost during the Battle of Beijing. Unable to go offline and return to modern times. If you win, you will be rich and glorious; if you lose, you will be trapped here forever. A thousand live-action people and 50,000 immortal iron troops fought against 600,000 Dashun troops. Without King Qin's guidance, there is no way out. There is only this city and a battle that must be won.