King Hyojong of Joseon

King Hyojong initiated a plan to launch a military campaign against the Qing dynasty to avenge the fall of the Ming and Joseon's subjugation. He expanded the army and fortified northern defenses, but the expedition was never carried out due to his death and lack of support.

Hyojong's reign was marked by ongoing factional struggles between the Westerners and Southerners factions at court. These conflicts hindered his ability to implement reforms and pursue his northern expedition plans, contributing to political instability.