Fortress tactics, from Zhang Xuan.
In history, Zhang Xuan sent the Western Xia into a desperate situation and encroached on the territory of the Western Xia by building strongholds.
After Zhang Xuan, Sun Chengzong in the late Ming Dynasty used this tactic to fight against Houjin, and Zeng Guofan in the late Qing Dynasty used this tactic to fight against the Taiping Army.
Now, Zhao Kuangyin used it to fight against Byzantines.
Each fortress builds a big net for a few points, where it can be built, the Song Dynasty has plenty of money.
Now, the last three Byzantine cities have been surrounded and enclosed.
We are about to launch the final general attack, and go home to see my wife and my mother after the fight