The Japanese began on 20 July 1593. First they destroyed the edges of the dikes surrounding Jinju to drain the moat, then they advanced on the fortress with bamboo shields. The Koreans fired on them and repelled the attack. On 22 July the Japanese tried again with siege towers, but they were destroyed by cannon fire. On 24 July the Japanese were able to successfully mine a section of the outer wall under mobile shelters. On 27 July The Japanese now attacked with armored carts called "tortoise shell wagons", which allowed the Japanese to advance up to the walls, where the sappers would pull out the stones and attacked the weakened area of the wall, and with the aid of a rainstorm, were able to dislodge its foundations. The fortress was quickly taken. Like after most Japanese victories in largely populated areas, there was a massacre. The Japanese then retreated to Busan.