Hansan and Admiral Yi Sun-sin’s Sea: How Joseon Changed the War

This KBS History Special documentary focuses on the Battle of Hansan Island and analyzes how Admiral Yi Sun-sin’s Joseon navy achieved a decisive victory during the Imjin War. According to the provided summary, the battle mattered because Japan needed to secure sea routes in order to support its land campaign. Blocking those maritime supply routes became a key task that could change the direction of the war.

The video explains the background of the battle by connecting Japan’s land advance with its need for naval supply lines. Toyotomi Hideyoshi’s forces had gained momentum on land, but maintaining that advance required control of the sea. Admiral Yi Sun-sin’s task was to prevent the Japanese navy from expanding westward and securing maritime movement.

A central focus is the crane-wing formation. Yi Sun-sin lured the Japanese fleet from the narrow waters of Gyeonnaeryang into a wider sea area, then deployed the crane-wing formation to surround and destroy the enemy fleet. The source emphasizes that this was not a random maneuver, but a tactical decision that used the sea conditions and the movement of the ships.

The documentary also highlights technical advantages. The turtle ship helped neutralize Japan’s preferred close-quarters boarding tactics. The panokseon, with its flat-bottomed structure, had strong turning ability and could carry large artillery. Joseon had also improved large cannons before the war, allowing its navy to strike enemy ships from a distance.

The source further discusses scientific and documentary evidence, including references to the current, the turning performance of ships, the structure of turtle ships, the use of artillery, the War Diary, and Japanese family records. Together, these materials support the idea that Hansan was not merely a battlefield victory, but a turning point that disrupted Japan’s plan to advance into the western sea and helped Joseon regain control of the southern waters.