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Joseon Military System Reforms (1430s)

Type Event Region East Asia Time 1431–1440

In the 1430s, King Sejong's court systematically reformed the military, strengthening the Five Guards, border garrisons, firearms, and fortifications…

Timeline

  1. 1431–1433Five Guards garrisons in Hanseong · Joseon dynastyThe court reviewed the military register, filled vacancies in the Five Guards, and reorganized palace guards and capital defense, ensuring the central army's rapid mobilization capability for the capital and key locations.
  2. 1433–1437Four Commanderies and Six Garrisons, Hamgyeong Province · Hamgyeong ProvinceAfter the Jurchen campaigns, the court dispatched additional border troops, built fortresses, and deployed firearms, combining the Four Commanderies and Six Garrisons defense line with the military-agricultural colony system to form a sustainable northeastern defense network.
  3. 1438–1440Coastal Gyeongsang Province · Gyeongsang ProvinceThe court strengthened firearms production and deployment and pre-positioned defenses along the southeast coast against potential pirate threats, extending military reform moderately from land defense to coastal defense.

Sources