Sun Chengzong vs Wanyan Zongbi

Sun Chengzong was appointed as a Grand Secretary and given oversight of military affairs in Liaodong. He advocated for a forward defense strategy, including the construction of the Ningyuan fortress to block Manchu advances.

Sun Chengzong oversaw the construction of the Ningyuan fortress, a heavily fortified stronghold on the Liaodong coast. This base became a key defensive position that later withstood Manchu sieges and delayed their advance.

Sun Chengzong recognized the talent of the young official Yuan Chonghuan and promoted him to a key military role in Liaodong. Yuan later became the Ming's most effective general against the Manchus, winning the Battle of Ningyuan.

Sun Chengzong retired from office in the 1630s due to political infighting and died at age 75. His strategic vision for Liaodong was largely abandoned after his departure, contributing to the eventual Manchu conquest.

Wanyan Zongbi led a major Jin invasion of Southern Song territory, advancing deep into the south. He captured the Song capital of Hangzhou temporarily but was eventually repelled by Song forces.

Wanyan Zongbi's Jin army was defeated by Yue Fei's Song forces at Yancheng. This battle was a major setback for Jin and demonstrated the effectiveness of Yue Fei's military tactics.

Wanyan Zongbi played a key role in negotiating the Treaty of Shaoxing with the Southern Song. The treaty established the Huai River as the border and required Song to pay tribute to Jin, ending major hostilities.

Wanyan Zongbi demanded the execution of Yue Fei as part of the peace settlement. The Song court complied, executing Yue Fei, which removed a major obstacle to Jin's security.

Wanyan Zongbi died, having been one of the most influential Jin generals. His campaigns and diplomacy shaped Jin-Song relations for decades.