Japanese Invasions of Korea and Gunpowder Weapons


Korean and Chinese soldiers assault the Japanese-built fortress at Ulsan.

Although guns were widely available in the struggle for supremacy in China during the mid-fourteenth century, they became a cornerstone of the Ming army only after the Ming conquest of China. Before the end of the fourteenth century, almost 10 percent of the army’s 1.2–1.8 million soldiers were armed with guns. The capital’s arsenals produced 3,000 cannon and 3,000 handguns annually from 1380 to 1488. These weapons were widely deployed and initially gave Ming armies an advantage over neighboring states that were not so armed. European advances in gun technology were quickly adopted in China, and the cannon it brought into the field owed as much to the West as did the Japanese army’s muskets.

Hideyoshi’s invasions of Korea brought about a direct clash between three different gun-armed forces, the Japanese, Chinese, and Koreans. Japanese forces were armed with muskets and trained in volley fire; Chinese forces relied upon cannon; and Korean forces used cannon on armored warships to interdict Japanese maritime supply lines. On the strategic level, the Japanese were completely defeated, achieving none of their political or military goals at a tremendous loss of life. Tactically, the results were more mixed. Chinese armies succeeded when they brought their cannon up to the battlefield, and lost when they did not. The Korean navy defeated the Japanese navy using cannon to oppose their boarding tactics, but was ineffective when poorly commanded. Overall, the conflict demonstrated that guns, whether muskets or cannon, were now critical in East Asian warfare.

After the first Japanese campaign (1592–3) was driven back to the southern tip of Korea, the Ming attempted to improve the Korean army by training its soldiers to use firearms. The course of the war surprised all sides, revealing deep-seated weaknesses within everyone’s armed forces. By campaigning outside of Japan, Hideyoshi subjected the Japanese army to new military problems that it struggled to overcome. The Korean and Chinese forces suffered similar difficulties in dealing with new modes of warfare. For example, the Ming army, which possessed several different kinds of troops based upon their regional origins, had to bring southern Chinese troops, who had previously fought against ‘‘Japanese’’ pirates, to the battlefield in order to engage the Japanese in close combat. Northern Chinese troops, who emphasized cavalry and had no experience of the Japanese, were generally regarded as ineffective.

It is impossible to draw conclusions about which mode of warfare was superior without taking into account the specific conditions and commanders of a given battle. Japanese superiority in close combat, and in medium-range missile firing through their use of muskets, was negated when Chinese cannon were present on the battlefield. At the same time, the test of combat could be rendered moot by larger strategic issues. Japanese attempts to hold and control Korean territory, combined with a desire to avoid large-scale battles with the Chinese and their cannons, induced them to disperse their troops and focus on ambushes and placing small garrisons in key locations. These tactics then exposed them to even greater risk, as Korean partisans were able to ambush small Japanese units, or harass their supply lines.

Hideyoshi’s invasions, like the construction of the Great Wall, demonstrated once again the close connection between siege warfare, naval warfare, and guns. While troops in the field could maneuver to take advantage of their own strengths and avoid those of their opponents, sometimes to the extent of refusing battle entirely, siege and naval warfare quite often did not allow that possibility. Strong points had to be taken if territory was to be controlled, certain sailing routes had to be used at certain times if ships were to reach their destination. One of the greatest weaknesses of the Japanese war effort was the Japanese navy, a rather surprising circumstance given the competence of Japanese sea lords earlier in the sixteenth century.

Sengoku Jidai: Shadow of the Shogun

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