Sun Chengzong vs Tran Hung Dao

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.

Tran Hung Dao commanded Vietnamese forces to repel the first Mongol invasion under Uriyangkhadai. The Mongols captured Thang Long but were forced to retreat due to supply issues and guerrilla tactics. The victory established Tran Hung Dao's reputation as a military leader.

Tran Hung Dao wrote the Hich Tuong Si, a famous military treatise and call to arms, to motivate his troops before the second Mongol invasion. The text emphasized patriotism and the importance of defending the homeland. It became a classic of Vietnamese literature.

Tran Hung Dao led Vietnamese forces against a larger Mongol invasion led by Kublai Khan's son, Toghon. After initial setbacks, he regrouped and launched a counteroffensive that drove the Mongols out of Vietnam. The victory was achieved through strategic retreats and ambushes.

Tran Hung Dao achieved his greatest victory at the Battle of Bach Dang River, where he destroyed the Mongol invasion fleet. He used iron-tipped stakes hidden in the riverbed to impale enemy ships at high tide. The defeat ended Mongol attempts to conquer Vietnam.