Korean shipbuilding tradition centered on creating simple but structurally sound vessels that emphasized strength and power rather than speed.

Yi took 227 Korean ships and approximately 17,000 soldiers, landed, attacked, and plundered Japanese pirate settlements on Tsushima Island.

In the diplomatic exchanges that followed, Korea permitted the So clan to continue trade with Korean coastal harbors under the condition that they suppress the activities of Japanese pirates.

[8] During the reign of King Sejong, the naval forces were systematically organized in terms of the number of troops, military ships, and the establishment of forts at various ports.

Among the naval forces, positions such as Jinmu (鎭撫), Jiin (知印), Yeongsa (令史), Sagwan (射官), and Yeongseondumok (領船頭目) were given preferential treatment over lower-ranking soldiers.

[9] Originally, naval forces were supposed to serve at sea, but due to the management of military ships and arduous training, fortresses were established in the garrisons during King Seongjong's time.

Additionally, people of unclear status (양천불명자, 良賤不明者) and criminals were conscripted into the navy, causing the naval service to become a low-status duty.

[10] Consequently, during King Seongjong's reign, naval service became hereditary (세전, 世傳) to maintain a consistent number of maritime personnel.

When Admiral Yi Sun-sin inspected troops and pointed to defects, commanders explained their struggles that people were tired and there were not enough supplies and capacity and lacked military power.

Still, the naval forces under Admiral Yi Sun-sin of Jeolla Province won numerous victories, securing control of the sea and significantly impacting the war's outcome.

It allowed the higher military officers, the Jibyeonsa Jaesang (지변사재상; 知邊司宰相), to participate in the process of establishing security maneuvers to meticulously keep a keen eye on the issues of the border.

At the same time, the Jeeseungbangryak involved commanders leading their troops from the main garrison to designated defense areas for combat during emergencies.

Originally, the naval forces were supposed to work at sea, but because of the management of the ships and the arduous training, King Seongjong installed coastal fortresses.

[12][13] It was a highly inefficient arrangement since the nearby forces would remain stationary until the mobile border commander arrived on the scene and took control.

This system provided a steady stream of manpower for the Joseon Navy, which was able to maintain a large standing fleet capable of defending the country's coastal waters.

The Sogo system also provided a means of training and equipping sailors and naval officers, ensuring that the navy was always ready for action.

The Garrison Command system also facilitated the rapid deployment of troops to any part of the country, allowing the navy to quickly respond to any invasion or attack.

Their flat keel enables a ship to sit comfortably on the tideland when the tide is out, after coming ashore, or inside a pier in high water.

It also ensured greater mobility and a shallow draft and, in particular, allowed a ship to make sharp changes of direction at short notice.

It was a very traditional ship developed to emphasize the standard use of warships for maintaining peace on the coasts when the navy became useless after the end of King Sejong.

By having multiple levels, the rowers at the bottom were relatively safe, and marines at the top would have a height advantage over the enemy, firing down upon them and avoiding boarding the ship.

[17] A medium-sized combat ship from the late Joseon period armed with 4-6 cannons that erected shield plates on the hull to protect soldiers from enemy arrows and similar threats.

It is a combat ship that has shield plates of appropriate height erected on both sides of the upper deck to protect soldiers from enemy arrows and stones.

The oarsmen, gunners, archers, marines wore black military robes (hyeopsu Korean: 협수; Hanja: 夾袖) with white trimes.

But the gunners, archers, and marines on deck wore light blue long sleeveless vests (jeonbok, Korean: 전복; Hanja: 戰服).

It was composed of a helmet resembling European kettle hats with attached neck defenses of mail or lamellar, body armor reaching down to the thighs or knees, and a set of shoulder guards that protected the upper arm.

The standard polearm used in the navy was the jangchang (Korean: 장창; Hanja: 長槍), a four-meter spear wielded for thrusting and drawing while moving forward and backward.

'[37] During the Imjin War, Admiral Yi Sun-sin disrupted Japanese supply lines and engaged their fleets at strategic locations of his choosing, such as straits with small islands, and used currents to cripple them.

Yi Soon-shin recorded at Dangpo, "The turtle ship came close to the enemy flagship, raised its dragon head, and fired the Hyeonja cannon.

During the Battle of Hansando, Yi Sun-Shin dispatched a small detachment forward to lure the Japanese fleet, and they took the bait, following them into open waters off Hansan Island.