question: Which bathe was fought in winter, Battle of Pusan Perimeter or Battle of Stones River?
answer: Battle of Stones River
context: Title: Second Battle of Naktong Bulge
  Passage: The Second Battle of Naktong Bulge was an engagement between United Nations (UN) and North Korean (NK) forces early in the Korean War from September 1 to September 15, 1950, along the Naktong River in South Korea.  It was a part of the Battle of Pusan Perimeter, and was one of several large engagements fought simultaneously.  The battle ended in a victory for the United Nations after large numbers of United States (US) and Republic of Korea (ROK) troops repelled a strong North Korean attack.
  Title: Battle of Battle Mountain
  Passage: The Battle of Battle Mountain was an engagement between United Nations (UN) and North Korean (NK) forces early in the Korean War from August 15 to September 19, 1950, on and around the Sobuk-san mountain area in South Korea.  It was one of several large engagements fought simultaneously during the Battle of Pusan Perimeter.  The battle ended in a victory for the UN after large numbers of United States (US) and Republic of Korea (ROK) troops were able to prevent a North Korean division from capturing the mountain area.
  Title: Battle of Taegu
  Passage: The Battle of Taegu was an engagement between UN and North Korean forces early in the Korean War, with fighting continuing from August 5–20, 1950 around the city of Taegu, South Korea.  It was a part of the Battle of Pusan Perimeter, and was one of several large engagements fought simultaneously.  The battle ended in a victory for the United Nations after their forces were able to drive off an offensive by North Korean divisions attempting to cross the Naktong River and assault the city.
  Title: Battle of Pusan Perimeter logistics
  Passage: Logistics in the Battle of Pusan Perimeter (August 4 – September 15, 1950) during the Korean War played a decisive role in the battle.  Efficient logistics, the management of personnel and materiel, supported United Nations (UN) supply lines while the North Koreans' routes of supply were steadily reduced and cut off.  UN logistics improved throughout the Battle of Inchon and the defeat of the North Korean army at Pusan.
  Title: 15th Division (North Korea)
  Passage: The 15th Infantry Division was a military formation of the Korean People's Army during the 20th Century.  The division fought in the 1950 Korean War; it took part in the North Korean advance from Seoul to Taejon, and fought in the Battle of Pusan Perimeter.  The 15th Division fought along the eastern coast, above Pusan, eventually being annihilated.
  Title: Battle of Masan
  Passage: The Battle of Masan was an engagement between United Nations (UN) and North Korean (NK) forces, which took place early in the Korean War between August 5 and September 19, 1950, in the vicinity of Masan and the Naktong River in South Korea.  It was part of the Battle of Pusan Perimeter, and was one of several large engagements fought simultaneously.  The battle ended in a victory for the UN after large numbers of United States (US) and Republic of Korea (ROK) troops were able to repel the repeated attacks of two North Korean divisions.
  Title: First Battle of Naktong Bulge
  Passage: The First Battle of Naktong Bulge was an engagement between United States and North Korean forces early in the Korean War from August 5–19, 1950 in the vicinity of Yongsan (Yeongsan, Changnyeong county) and the Naktong River in South Korea.  It was a part of the Battle of Pusan Perimeter, and was one of several large engagements fought simultaneously.  The battle ended in a victory for the United States after large numbers of US reinforcements destroyed an attacking North Korean division.
  Title: Battle of Nam River
  Passage: The Battle of Nam River was an engagement between United Nations (UN) and North Korean (NK) forces early in the Korean War from August 31 to September 19, 1950, in the vicinity of the Nam River and the Naktong River in South Korea.  It was a part of the Battle of Pusan Perimeter, and was one of several large engagements fought simultaneously.  The battle ended in a victory for the United Nations after large numbers of United States (US) and Republic of Korea (ROK) troops were able to repel a North Korean attack across the river.
  Title: Battle of Pusan Perimeter
  Passage: The Battle of Pusan Perimeter was a large-scale battle between United Nations and North Korean forces lasting from August 4 to September 18, 1950.  It was one of the first major engagements of the Korean War.  An army of 140,000 UN troops, having been pushed to the brink of defeat, were rallied to make a final stand against the invading North Korean army, 98,000 men strong.
  Title: Battle of Stones River
  Passage: The Battle of Stones River or Second Battle of Murfreesboro, was fought from December 31, 1862, to January 2, 1863, in Middle Tennessee, as the culmination of the Stones River Campaign in the Western Theater of the American Civil War.  Of the major battles of the Civil War, Stones River had the highest percentage of casualties on both sides.  Although the battle itself was inconclusive, the Union Army's repulse of two Confederate attacks and the subsequent Confederate withdrawal were a much-needed boost to Union morale after the defeat at the Battle of Fredericksburg, and it dashed Confederate aspirations for control of Middle Tennessee.
citations: Battle of Stones River Battle of Pusan Perimeter