大单小单大双小双赔法简介：If the Qing soldiers wanted to enter the city through the city gate, they had to capture the fort first, otherwise the bows and arrows and muskets in the fort would cause huge damage to the incoming and siege troops.
If the Qing soldiers wanted to enter the city through the city gate, they had to capture the fort first, otherwise the bows and arrows and muskets in the fort would cause huge damage to the incoming and siege troops.
