Battle of Chumonchin Chan

What Happened

On 2 July 1950, warships of the United Nations force encountered vessels of the Korean People's Navy off the east coast of the Korean peninsula, in the waters of the Sea of Japan. The engagement is known in English as the Battle of Chumonchin Chan. It was fought between surface combatants, and it opened when an Allied flotilla came upon a supply fleet of the Korean People's Navy.

The action was brief and one-sided. The Allied force — which included British warships — caught the North Korean supply vessels and engaged them. The date places the battle in the opening weeks of the Korean War, which had begun the previous month.

Background

The Korean War began in late June 1950, when forces of the Korean People's Army crossed south of the 38th parallel into the Republic of Korea. The United Nations Security Council moved quickly to authorise member states to assist the Republic of Korea, and naval forces from several countries were dispatched to Korean waters.

The United Kingdom was among the states that committed naval power to the UN effort. British and other Allied ships were tasked with controlling the sea approaches to the peninsula: interdicting supply routes, supporting ground operations, and preventing the Korean People's Navy from moving men and materiel along the coast.

The east coast of Korea, facing the Sea of Japan, was one such route. Supply traffic moving by sea along that coast was a natural target for the Allied flotilla, and on 2 July 1950 an Allied force encountered exactly that kind of traffic.

In Japan, the year 1950 fell in the Shōwa era (昭和, Shōwa, "bright peace"), the reign period of the emperor Shōwa, which ran from 1926 to 1989. 1950 was the twenty-fifth year of that era, so the battle is dated in Japanese records to Shōwa 25. Japan itself was not a belligerent: the country was under Allied occupation at the time, and the war on the neighbouring peninsula was fought by UN forces, including the United Kingdom, against North Korean forces.

Why It Mattered

The Battle of Chumonchin Chan belongs to the earliest phase of the Korean War, when UN naval forces were still assembling and establishing control of the waters around the peninsula. Its significance lies in what it represented: the first armed contact between Allied surface combatants and the Korean People's Navy in the war.

By breaking up a North Korean supply fleet, the action struck at the logistics that sustained the North Korean advance southward. Supply interdiction of this kind was one of the principal jobs of the UN navies in the summer of 1950, and the engagement of 2 July was an early demonstration of it.

The battle also marked the entry of British naval power into direct combat in the Korean War. The United Kingdom's participation alongside other UN member states turned the conflict from a peninsula war into a multinational one, and the action off Chumonchin Chan was one of the first places that multinational character showed itself at sea.

The Name in Japanese

The Japanese name of the battle is:

注文津港海戦

Its reading in kana is チュムンジンこうかいせん, and in romaji it is Chumunjin kōkaisen.

The name is a compound of four elements, and each kanji can be broken down as follows.

注 — read here as チュ (chu). This character means "pour" or "annotate" in ordinary Japanese, but in this name it is used purely for its sound, to write the first syllable of the Korean place name Chumunjin. This kind of kanji use — where the character carries only a phonetic value and not its usual meaning — is common in Japanese renderings of foreign place names.

文 — read here as ムン (mun). The character normally means "writing", "text" or "sentence". As with 注, its role here is phonetic: it supplies the mun of Chumunjin.

津 — read here as ジン (jin). This is the one element of the place name that carries its ordinary meaning. 津 (tsu) means "harbour", "port" or "ferry crossing", and it is a very common element in Japanese place names — for example in 大津 (Ōtsu) and 津軽 (Tsugaru). Written as jin in this compound, it marks Chumunjin as a port.

港 — read here as こう (kō). This character means "harbour" or "port". It is added after the place name to specify the harbour itself, so 注文津港 (Chumunjin-kō) is "Chumunjin Harbour" or "the port of Chumunjin".

海戦 — read here as かいせん (kaisen). This is a two-character compound: 海 (kai) means "sea", and 戦 (sen) means "war", "battle" or "combat". Together 海戦 means "naval battle" or "sea battle". It is the standard Japanese term for a fleet action, and it appears in the names of many famous engagements in Japanese naval history.

Put together, 注文津港海戦 means, literally, "the naval battle of Chumunjin Harbour". The structure is typical of Japanese battle names: the place, marked as a harbour, followed by 海戦 to classify the event as a sea fight.

Key Figures

The engagement was fought between surface combatants of the Allied flotilla and a supply fleet of the Korean People's Navy. The United Kingdom is recorded as a participant in the battle, and British warships formed part of the Allied force present.

No individual commanders are recorded for this action.