Pak Ŭijang (; 1555 – 25th day, 1st month of 1615) was a Korean military commander active during the mid-Joseon period. Born in 1555 in Yŏnghae, Gyeongsang Province, Pak Ŭijang passed the military service examination In 1577 and in 1587 was appointed Ch'ampong of the Government Arsenal, receiving his first regular government post. After serving in various positions, he became Executive Assistant to Magistrate of Gyeongju in 1591.
When the Imjin War broke out in the 4th month of 1592, Pak first proceeded to Dongnae but soon returned to Gyeongju, where he took part in the fortess's defense; overwhelmed by superior numbers, however, he was forced to retreat. Regrouping his forces, he joined the Siege of Yeongcheon and subsequently fought in the Siege of Gyeongju. Although the first attempt to retake the fortress failed, in the second he personally led his troops, employing guerrilla tactics and incendiary operations to achieve success.
The following year he repelled Japanese forces at P'ajam and Ulsan, after which he was appointed Mayor of Gyeongju. In that role he devoted himself both to relief for the populace and to military operations, winning distinction in several engagements. When the Chŏngyu War broke out in 1597, Pak continued to secure victories at Yeongcheon, Angang, and Madŭngo, later serving under Ming and Joseon commanders in joint operations. Although the failed siege of Ulsan forced his withdrawal, he returned to fortify Gyeongju and contributed vital provisions.
After the war he held offices including Magistrate of Seongju and Provincial Military Commander of Left Gyeongsang, before dying in 1615 while serving as Provincial Naval Commander of Gyeongsang. Pak was posthumously promoted to Minister of Taxation and was conferred the posthumous title Muŭi. He was also enshrined at Chŏngchungsa in Yŏnghae and at Kubong Chŏngsa.
Early life
Birth and education Pak Ŭijang was born in 1555 as the eldest son at Wŏn'gori () in , Joseon. He belonged to the ; his father, Pak Seryŏm (), served as Magistrate of , and held other official posts, while his mother, Lady Nam of the Yeongyang Nam clan, daughter of Nam Sijun (). His younger brother, Pak Hongjang, born in 1558, was dispatched to Japan during the Imjin War.
In 1567, Pak Ŭijang, through the arrangements of his father, Pak Seryŏm, and his uncle, Pak Sehyŏn (), commenced studies under Kim Ŏn'gi (), a disciple of Yi Hwang. He studied alongside Kwŏn Wi () and Sin Chije (), focusing on the Confucian classics and historical texts while concurrently engaging with military treatises. In 1577, he passed the special military examination, receiving assessments from examiners that noted his proficiency in both scholarly and martial disciplines. Following his success in the examination, he continued scholarly exchanges with Kŭm Nansu (), also a disciple of Yi Hwang, indicating sustained involvement in academic activities.
Early career Pak Ŭijang began his government service in 1579 with his appointment as Probationary Record Keeper () at the Office of Military Training (). In 1587, he was appointed Ch'ampong () of the Government Arsenal (), thereby entering a regular government post. The following year, he successively served as Assistant Record Keeper (), Record Keeper (), and Duty Chief () within the same office. He was subsequently transferred to the position of Recorder () at the Granary of Official Emoulements (), and later returned to serve as Recorder at the Government Arsenal. In the 12th month of 1588, he was appointed Magistrate of , an external posting. In the 6th month of 1589, he concurrently held the position of Magistrate of Haman, and in 1591, he was appointed Executive Assistant to Magistrate () of Gyeongju.
Imjin War
Outbreak of the Imjin War In the 4th month of 1592, at the outbreak of the Imjin War, Pak Ŭijang, upon receiving urgent reports, advanced with the troops of the Gyeongju Garrison to Dongnae in coordination with Yi Kak, Provincial Military Commander () of Left Gyeongsang, as part of the initial mobilization. After the fall of Dongnae Fortress and the northward advance of the Japanese First Division under Konishi Yukinaga, Yi and Pak to retreated to Eonyang. When Yi subsequently sought to relocate from Eonyang to the at Ulsan, Pak argued for continued resistance at Eonyang. However, with the approach of the Japanese Second Division under Katō Kiyomasa, Yi retreated to Ulsan and instructed Pak to return to Gyeongju Fortress to defend the Left Route of Gyeongsang Province.
Upon returning to Gyeongju, Pak Ŭijang found that the inhabitants had already dispersed. Shortly after his arrival, Yun Inham, the Magistrate of Gyeongju, transferred 500 soldiers under the command of Yi Kak to Pak and departed the fortress to assume the post of Fugitive Apprehension Commander (). Having thus obtained effective military authority, Pak, in coordination with Yi Suil, Magistrate of , undertook the defense of Gyeongju Fortress. When the vanguard of the Japanese Second Division approached, a large number of soldiers fled, and Pak's forces were overwhelmed and disintegrated under superior enemy strength. On the 21st day of the 4th month, Gyeongju Fortress was captured, prompting Pak to withdraw toward . Although advised by some to proceed to the royal court in temporary exile, Pak chose to remain in Gyeongju and began preparations for a recapture operation based in .
Siege of Yeongcheon From his base in Jukjang, Pak Ŭijang rallied dispersed civilians and soldiers, established a forge to manufacture arrows and other weapons, and reorganized his forces. He conducted guerrilla operations against the Japanese, securing victories at Ch'oje () and . In the 7th month of 1592, he received a request for military assistance from the Righteous army leader Kwŏn Ŭngsu for the recapture of Yeongcheon Fortress, and he joined Kwŏn's forces at the head of government troops.
On the 26th day of the 7th month, the Joseon army launched its assault on the fortress. As night fell, the force divided into two main contingents, with Pak and Kwŏn commanding the northwestern sector. The following day, Pak concentrated his attack on the west and north gates, employing hand-to-hand combat and incendiary tactics, which resulted in the recapture of Yeongcheon Fortress. In recognition of his service in the operation, Pak was appointed Vice Director () of the Directorate of the Palace Buildings ().
Siege of Gyeongju Following the successful recapture of Yeongcheon Fortress, the Joseon forces launched an operation to retake Gyeongju Fortress. The Provincial Military Commander of Left Gyeongsang, Pak Chin, directed the campaign, assembling government troops and righteous armies at Angang in Gyeongju, with Pak Ŭijang joining the force. On the 20th day of the 8th month, the Joseon army departed Angang and reached Gyeongju Fortress at dawn the following day. Establishing their command post on a cliff across the Seocheon River, they surrounded the fortress on its eastern, western, and northern sides, with Pak Ŭijang commanding the vanguard on the eastern front.
The assault began with the setting of fires to civilian houses outside the fortress as a signal to attack. In the ensuing protracted engagement, Japanese reinforcements concealed at Baengnyulsa Temple () and the local Confucian school joined the battle, surrounding the Joseon forces. Simultaneously, Japanese troops within the fortress opened the north gate and mounted a counterattack. The Joseon army was forced to withdraw across the Seocheon River to Angang, during which Pak Ŭijang sustained a shoulder wound.
Following the failed attempt to recapture Gyeongju Fortress, the Joseon forces regrouped at Angang on the 25th day of the 8th month, 1592. Provincial Military Commander Pak Chin proceeded to Daegu to meet with the newly appointed Governor of Left Gyeongsang, Kim Sŏngil, delegating military command to Pak Ŭijang. Abandoning large-scale frontal assaults, Pak adopted guerrilla tactics utilizing a forlorn hope. From among the government troops and local righteous armies, he selected approximately 1,000 men, including Kim Tŭkpok (), appointing Kim as Guard Commander (), with , Pak Ch'unmu () and others as Staff Officers (), while assuming the role of vanguard commander himself. He assigned the Left Provincial Army stationed at Angang to provide covering support, and positioned beacon guards in nearby mountains to light signal fires simultaneously, creating the impression of a large force.
On the 7th day of the 9th month, a concentrated engagement commenced. During the day, Pak Ŭijang led the forlorn hope in guerrilla warfare. At night, under the cover of the Left Provincial Army, he led the vanguard in executing incendiary operations. In particular, the , a newly developed timed explosive weapon created by , was continuously launched into the fortress, inflicting considerable casualties and sowing confusion among the Japanese, who had never encountered such a weapon. Despite their disarray, the Japanese maintained a staunch defense, prolonging the battle into the following day. On the night of the 8th day of the 9th month, after fierce fighting, the Japanese forces withdrew to in Ulsan, and the Joseon army successfully recaptured Gyeongju Fortress.
Pak Ŭijang, while pursuing the fleeing Japanese forces with his elite troops, advanced into Gyeongju Fortress. There, he found the —which had housed the royal portrait of King Taejo—collapsed, and the remaining structures reduced to ashes. Nevertheless, he secured over 40,000 sŏk of grain preserved in the storehouses. He further dispatched troops to block the routes to Eonyang and Ulsan, and to secure the road linking Yeongcheon and .
Battle of P'ajam After the Ming–Joseon allied forces recaptured Pyongyang Fortress in the 1st month of 1593, the Ming court sought to bring the Imjin War to a close through peace negotiations with Japan. Against this backdrop, on the 10th day of the 3rd month, Pak Ŭijang led 300 troops into combat against roughly 2,000 Japanese soldiers at P'ajam () in Daegu. Following their defeat at Gyeongju, Japanese forces moved back and forth through Miryang and Cheongdo en route to Daegu. To cut off their passage, Pak lay in ambush at P'ajam and launched a surprise attack. Employing arquebuses which he had become proficient in through his exchanges with Kim Ch'ungsŏn, Pak achieved a decisive victory. In the 5th month of 1593, he subsequently joined Kim T'aehŏ (), the Magistrate of Ulsan, in driving out Japanese forces stationed in Ulsan. For his meritorious service at the Battle of P'ajam, Pak was promoted to the senior third rank of Grand Master for Comprehensive Governance () and appointed Mayor of Gyeongju.
Mayoralty of Gyeongju Pak Ŭijang procured over 40,000 sŏk of grain, which he used both to relieve famine-stricken civilians and to sustain military training in preparation for further conflict with the Japanese. He also implemented a system of , enabling displaced peasants to resume their livelihoods despite the devastation of the Imjin War. Militarily, he reorganized local forces into specialized units—suicide squads, supply corps, and peasant militias—allocating wartime duties according to the needs and conditions of the populace.