The Battle of Korea Strait was a single ship action fought on the first day of the Korean War on 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 invasion force near Busan but was encountered by the South Korean patrol ship ROKS Baekdusan and sunk. It was one of the first surface actions of the war and resulted in an important South Korean victory.

The First Battle of Naktong Bulge was an engagement between United Nations Command (UN) and North Korean forces early in the Korean War from August 5–19, 1950 in the vicinity of Yongsan 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 UN after large numbers of US reinforcements destroyed an attacking North Korean division.

The Battle of Chuncheon was one of a series of coordinated attacks beginning on 25 June 1950 that marked the beginning of the Korean War.

The Second Battle of Naktong Bulge was an engagement between United Nations Command (UN) and North Korean 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 Army (US) troops repelled a strong Korean People's Army (KPA) attack.

The Battle of Ka-san was an engagement between United Nations Command (UN) and North Korean forces early in the Korean War from September 1 to September 15, 1950, in the vicinity of Ka-san , Chilgok County 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 Army (US) and Republic of Korea Army (ROKA) troops repelled a strong Korean People's Army (KPA) attack.

The Battle of Yongsan was an engagement between United Nations Command (UN) and North Korean forces early in the Korean War from September 1–5, 1950, at Yongsan 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 Army (US) repelled a strong Korean People's Army (KPA) attack.

In the Battle of the Bowling Alley , United Nations Command (UN) forces defeated North Korean forces early in the Korean War near the city of Taegu, South Korea. The battle took place in a narrow valley, dubbed the "Bowling Alley", north of Taegu. It followed a week of fighting between the Korean People's Army (KPA) 13th Division and the Republic of Korea Army's (ROKA) 1st Division along the latter's last defensible line in the hills north of the city. Reinforcements, including the US Army's 27th and 23rd Infantry Regiments were committed to bolster the ROKA defenses. This battle and several others were smaller engagements of the Battle of Pusan Perimeter.

The Battle of Chochiwon was an early engagement between United States and North Korean forces during the Korean War, taking place in the villages of Jeonui-myeon and Jochiwon in western South Korea on July 9–12, 1950. After four days of intense fighting, the battle ended in a North Korean victory.

The Battle of Yongdong was an engagement between United States and North Korean forces early in the Korean War. It occurred on July 22–25, 1950, in the village of Yongdong in southern South Korea. The newly arrived US Army 1st Cavalry Division was ordered there to cover the retreat of the US 24th Infantry Division after the Battle of Taejon. The 1st Cavalry Division soldiers, however, were untried in combat, and the North Korean Korean People's Army's (KPA) 3rd Division was able to outmaneuver them and force them back.

The Battle of Ongjin Peninsula was a series of battles that occurred in Ongjin Peninsula between 25 and 26 June 1950 and was a part of the Operation Pokpung and Operation Western Region that marked the beginning of the Korean War. On 25 June, the Korean People's Army (KPA) 3rd 38-Guard Brigade, reinforced with the 1st Infantry Regiment of the 6th Infantry Division, launched a surprise attack on the Republic of Korea Army (ROKA) 17th Infantry Regiment in Ongjin Peninsula, modern-day Ongjin and Kangryong. The battle ended on 26 June with a KPA victory, but many ROKA troops were able to escape from the peninsula.