Chapter 1 Summary: In 1582, Nobunaga thwarted an attempted assassination attempt. In the following campaigns, he effectively unified Japan by 1589. With Japan unified, Nobunaga turned to inward reforms, such as promotion of Europeanization, as well as external expansion at the expense of China. This external expansion resulted in the declaration of war against Korea in 1591.
Chapter 2 Summary: In 1592 Japan launched its invasion of Korea. The invasion went well overall, capturing the capital of Hanseong and advancing up to the Imjin River. Korean advantages at sea, which were causing Japanese supply problems, were neutralized by the capture of Jeolla Province, where the Korean navy was based. These Japanese successes prompted the Ming to intervene on behalf of Korea at the end of 1542.
Chapter 3 Summary: 1593 saw the arrival of Ming relief forces. At first, both sides underestimated each other, leading to several bloody defeats of both sides. Eventually Nobunaga began seeking a diplomatic solution to the war. His general Hideyoshi, wishing to negotiate from a position of strength conceived of a plan that lead to the capture of the Korean King Seonjo.
Chapter 4:
The Sun Sets
When the Ming Emperor, Wanli, heard of the capture of the Korean King Seonjo, he became furious. To him, this was the supreme insult to the Chinese tributary system, which correspondingly was an insult to the Ming Emperor himself. Thus, instead of its intended effects of allowing the Japanese to negotiate from a position of strength, the capture of the Korean king had nearly the opposite affect, causing the Ming to become more determined than ever to put the Japanese in their proper place. To accomplish this, the Wanli Emperor ordered the Ming expeditionary force doubled, from 100,000 men to 200,000 men.
Meanwhile, in Korea, the country was entering into its own political crisis as a result of the capture of the king and most of its court. In the resulting power vacuum, two forces emerged. The first, naturally enough, was the Ming General Li Rusong, who held vast influence by right of having the largest pro-Korean army in the area of the capital, as well as because he represented the Ming Empire. The second group to take advantage of the power vacuum to prosper was the Korean Western faction. In Korean politics, the Western and Eastern were born during King Seonjos reign around two leading scholars, Sim Ui-gyeom and Kim Hyowon. The group headed by Sim Ui-gyeom became the Western faction, which championed conservative values, while Kim Hyowons group became the Eastern faction, noted for its call for liberal reforms. During the war with Japan, the Eastern faction held the upper hand, primarily championed by the Prime Minister Yu Seong-ryong. This meant, however, that during the Japanese raid of Pyongyang, the Eastern faction found many of its leaders captured along with the king, including the Prime Minister. This left the remaining Eastern faction members who escaped in a vulnerable position compared to the Western faction, who mostly escaped the Japanese raid.
The Western faction began almost immediately in consolidating the position of power in which they found themselves. In this effort, they were supported by General Rusong, who approved of the Westerners pro-Ming, pro-conservative agenda. Moving quickly, the Western faction had King Seonjos firstborn son, Prince Imhae, declared the Crown Prince, stripping the title from Prince Gwanghae, who had supported the Easterners. Prince Gwanghae, having had virtually all of his significant political allies captured by the Japanese, fled to the north, eventually finding refuge with the Manchu. The elevation of Prince Imhae to Crown Prince had an additional benefit for the Western faction as Prince Imhae was extremely incompetent, making him a mere puppet to the Western faction. Another significant victim of the Western factions consolidation of power was the former Admiral Yi, who was re-accused of treason, specifically giving the Japanese plans for the Kobuksons and giving them vital information that directly lead to the raid on Pyongyang, and was executed.
As both sides waited on the return of the peace envoys sent to the Ming court, a stable front began to be built as both sides began fortifying their lines. These fortifications used as their basis the inferior Korean castle system, supplemented by newly constructed forts that were better suited for the gunpowder combat that both sides used. The Japanese efforts were hampered more, however, as they began suffering under a renewed insurgency campaign undertaken by the occupied Koreans. In one incident, Hideyoshi attempted to have the captured King Seonjo dispel a particularly angry crowd, only to have the crowd turn on King Seonjo, pelting him with whatever came into the crowds hands. King Seonjo was quickly escorted away by Japanese troops, but not before suffering several cuts and bruises.
As the spring of 1594 continued, Hideyoshi began to suspect that the peace negotiations were failing, and thus began preparations for a renewed offensive. As part of the preparations for this renewed offensive, Hideyoshi began issuing proclamations in the name of King Seonjo, denouncing the unlawful elevation of Prince Imhae and supporting Prince Gwanghae. Through this, Hideyoshi hoped to exploit Korean factionalism, as well as pave the way for the possible eventual use of King Seonjo was a Japanese puppet ruler. These efforts proved futile, however, as the presence of the large Ming army as well as the efficiency of earlier Eastern purges had temporarily silenced criticism of the ruling Western faction.
Before Hideyoshi could implement an alternate plan, the Ming seized the initiative. Bolstered by 50,000 reinforcements from China, General Rusong began an advance. Simultaneously, the remnants of the Korean fleet merged with a large Chinese fleet under the command of General Chen Lin. In General Chen Lin, the allies perhaps did not have a man equal to the brilliance of the recently deceased Admiral Yi, but they did have a quality general who was more than a match for his Japanese counterpart. In addition, the Chinese vessels under his command were at least equal to their Korean counterparts, making them vastly superior to the bulk of the Japanese fleet. The Chinese also brought along their own version of the Korean Kobuksons, the falcon boat. A defeat of the outnumbered Japanese fleet convinced the Japanese to retreat their fleet to their controlled ports, where they would be sheltered by the cannons of the shore forts, while depending on their convoy system to keep their supply lines open.
The Chinese success on the seas mirrored their success on land. As more and more reinforcements poured in to Korea from China, Ming forces began to slowly advance, overrunning Japanese positions one at a time. In order to reverse this situation, the outnumbered Hideyoshi attempted to bolster his front line troops with Japanese troops that were garrisoned throughout southern Korea. However, these actions gained him few troops, because of the need to keep Japanese garrisons to combat the Korean militias that were operating behind his lines.
Nobunaga, seeing his attempts at a diplomatic solution having failed, became fatalistic towards the war. Already, Japanese casualties had exceeded his expectations. In addition, while some Japanese commanders were still enthusiastic about Japanese prospects in the war, more and more were advocating Japan take defensive positions, while others advocated withdrawing from Korea completely. As a result, Nobunaga became loath to send more troops to Korea. This stance was further reinforced by a private letter from Hideyoshi, who confided that he felt he would need a further 150,000 men, or double the number of troops already in Korea, to successfully pacify Korea.
As 1594 drew to a close, two events served to determine the direction of the war. The first occurred in Jeolla Province. This province had proved to be a critical battleground in the war. While the Koreans held it, it served to be a dagger in the heart of Japanese supply routes, interrupting them and forcing vast detours which served to hamper Japanese attempts at resupplying their army. Because of the strategic importance of this province, General Chen Lin determined to retake it at any costs. In this effort he was aided by a 10,000 strong Korean militia group operating in the area under the command of Gwak Jae-u. The Japanese, also realizing the significance of the area had devoted significant resources to maintain the province.
A major sea battle thus developed of the shores of Jeolla province, as General Chen Lin sought to win control over the local seas, which would allow him to directly support Gwak Jae-u efforts on land. Opposing Chen Lin was the bulk of the Japanese fleet, under the command of Yukinaga. Technologically, both sides were roughly equal, though the Chinese-Korean forces held a slight edge in the main ships that made up the bulk of each navy. The Japanese fleet consisted of slightly less than 100 ships, of which 7 were of the Kobuksons design, 25 which were of a modified panokson battle ships design, which were suitable for a bombardment strategy, 37 were the large and unwieldy Japanese atakebune design, and the rest which were of the traditional Japanese design which were more suited to boarding actions. Facing them were 150 Sino-Korean ships, of which 10 were of the Kobuksons design, while the rest were of a panokson-like design.
The battle began with Yukinaga attempting to lure the Chinese fleet into coastal waters, where the Japanese could be supported by shore guns. The Chinese fleet refused to fall for the ploy and remained afar, where they occasionally traded shots with the Japanese fleet at long range. By this time, the capital of Jeolla Province, Yeosu, was under virtual siege by Gwak Jae-us forces, while Chen Lin used the Korean control of the countryside to keep his own fleet supplied. In addition, Chen Lin used his control of the seas to land regular Ming troops as well as began raiding Japanese supply convoys, heavily utilizing the fact that the bulk of the Japanese fleet were trapped by him in Yeosu. When a Japanese land relief force was turned away by Gwak Jae-us men, Yukinaga knew he had to act to prevent the fall of Yeosu. As a result, Yukinaga sailed out to give battle. In the resulting battle, Yukinaga attempted to use his Kobuksons to spearhead a breakthrough of the Chinese lines, while the Chinese attempted to use their superior numbers to envelop the Japanese fleet.
The Japanese strategy ultimately proved victorious, as they managed to break through the Chinese center. However, in the process, they received heavy damage, and the Chinese wings were able to disengage virtually intact. The casualties amounted to roughly the same for each side, however, the bulk of the Japanese casualties were among their best ships. As a result, this victory severely weakened the Japanese navy. While Jeolla province remained in Japanese hands, the Japanese navy proved to be weakened enough that the Sino-Korean forces were able to prey on supply convoys even more than before, weakening the overall Japanese position.
The second event that sealed the outcome of the war was the Ming breakthrough of the Imjin River defensive line. This defensive line had been prepared by Hideyoshi for almost the entirety of the war, and represented the best chance the Japanese had of holding back the numerically superior Chinese forces. Attrition began to wear on the Japanese, however, as their spotty supply situation combined with lack of reinforcements began to weaken their lines. In addition, messages were coming in from all over the south from Japanese commanders who were either being besieged by overwhelming numbers of Korean militia, or were spending all their time chasing said militia, preventing even further reinforcements and supplies from reaching Hideyoshi.
The turning point came with the critical siege of Wonsan. There, the Japanese had developed a significant defensive line in order to hold the gap that existed between where the Imjin River ended and the coast of Korea. It was through this mountainous terrain that over 100,000 Korean-Ming soldiers besieged 20,000 Japanese troops. Hideyoshi, realizing the importance of the siege, attempted to personally march there with reinforcements to lift the siege, but was frustrated by numerous attacks along the Imjin River by the Ming, which effectively tied him down. A spirited defense led to over 20,000 dead on the attackers side, but sheer weight of numbers eventually forced the Japanese to retreat. Though heavily bloodied, the victory proved essential for the Sino-Koreans, as it opened up the way to bypass the extensive fortifications along the Imjin River.
Realizing that the majority of his defenses were now indefensible in the long run, Hideyoshi did what he could, fortifying every possible spot before the Ming march, intending to sell each handful of Korean soil as dearly as he could. Meanwhile, he wrote letters to Nobunaga, begging for reinforcements to turn the tide of the war. Instead, when Nobunagas reply arrived, it carried not promises of more reinforcements, but orders for a general retreat.