The Japanese heartily approached Jinju fortress. They expected another easy victory at Jinju but the Korean general Kim Si-min defied the Japanese and stood firm with his 3,800 men. Again, the Koreans were outnumbered. Kim Si-min had recently acquired around 170 arquebuses, equivalent to what the Japanese used. Kim Si-min had them trained and believed he could defend Jinju. After three days of fighting, Kim Si-min was hit by a bullet on the side of his head and fell, unable to command his forces. The Japanese commanders then pressed even harder on the Koreans to dishearten them, but the Koreans fought on. The Japanese soldiers were still unable to scale the walls even with heavy fire from arquebuses. The Koreans were not in a good position since Kim Si-min was wounded and the garrison was now running low on ammunition. Gwak Jae-u, one of the main leaders of the Righteous armies of Korea arrived at night with an extremely small band, not enough to relieve the Koreans at Jinju. Gwak ordered his men to grab attention by blowing on horns and making noises. About 3,000 guerrillas and irregular forces arrived at the scene. At this time, the Japanese commanders realized their danger and were forced to abandon the siege and retreated.