Question: What ship sunk a North Korean ship in the Battle of Haeju?
About the article "Korean War", section "Naval warfare".

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The Battle of Haeju was a small naval battle during the main phase of Korean War.
Off Haeju Bay in the Yellow Sea, on September 10, 1950, days before the Battle of Inchon, South Korean Navy patrol boat "PC-703" encountered a North Korean Navy minelayer sailing vessel.
After a brief fight, the North Korean minelayer was sunk with a loss of all crew and no South Korean casualties were reported.
After the minelayer's sinking, "PC-703" discovered that the sunken vessel had laid a mine field at the mouth of the Haeju Man and then reported to base the location of the sea mines.
Two days later on September 12, "PC-703" encountered three small transports and sank them.
The three supply vessels were most likely unarmed.  
Haeju has a military and civilian dual purposes air station (HAE), with a 12/30 runway (Haeju Airport).
Haeju also has one of the major economic and military ports in North Korea.
It is connected to Sariwŏn via the Haeju Line. 
The Battle of Korea Strait was a small naval battle fought on the first day of the Korean War, 25-26 June 1950, between the navies of South Korea and North Korea.
A North Korean troop transport carrying hundreds of soldiers attempted to land its cargo near Busan but was encountered by a South Korean patrol ship and sunk.
It was one of the first surface actions of the war and resulted in an important South Korean victory. 
Because neither Korea had a large navy, the Korean War featured few naval battles; mostly the combatant navies served as naval artillery for their in-country armies.
A skirmish between North Korea and the UN Command occurred on 2 July 1950; the US Navy cruiser USS "Juneau", the Royal Navy cruiser HMS "Jamaica", and the frigate HMS "Black Swan" fought four North Korean torpedo boats and two mortar gunboats, and sank them.
During most of the war, the UN navies patrolled the west and east coasts of North Korea and sank supply and ammunition ships to deny the sea to North Korea.
Aside from very occasional gunfire from North Korean shore batteries, the main threat to US and UN navy ships was from magnetic mines the North Koreans employed for defensive purposes.
During the war, five U.S. Navy ships were lost (two minesweepers, two minesweeper escorts, and one ocean tug) all of them to mines, while 87 other warships suffered from slight to moderate damage from North Korean coastal artillery.
The USS "Juneau" sank ammunition ships that had been present in her previous battle.
The last sea battle of the Korean War occurred at Inchon, days before the Battle of Incheon; the ROK ship "PC 703" sank a North Korean mine layer in the Battle of Haeju Island, near Inchon.
Three other supply ships were sunk by "PC-703" two days later in the Yellow Sea.
Haeju is a city located in South Hwanghae Province near Haeju Bay in North Korea.
It is the administrative centre of South Hwanghae Province.
As of 2000, the population of the city is estimated to be 236,000.
At the beginning of 20th century, it became a strategic port in Sino-Korean trade.
Haeju has chemical-related enterprises and a cement factory.