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Date
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Action
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June 25
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North Korea invades South Korea with 135,000
men, initiating the Korean War.
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June 27
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President Harry S. Truman deploys the 7th Fleet
to waters off Taiwan to prevent the spread of the
conflict in Korea to other Far East waters.
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June 27
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First air victory of the war. A 68th All-Weather
Squadron F-82 shoots down a North Korean Yak
fighter. Two more enemy planes are destroyed in
this air battle.
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June 29
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Fifth Air Force's 3rd Bombardment Group sends 18
B-26 Invader light bombers against Heijo Airfield
near the North Korean capital of Pyongyang: 25
enemy aircraft are destroyed on the ground; one Yak
fighter is shot down.
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July 1
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First U.S. infantry unit arrives in Korea: 1st
Battalion, 21st Infantry Regiment, 24th Infantry
Division. Along with Battery A of the 52nd Field
Artillery Battalion, it comprises Task Force
Smith.
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July 2
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Off Chumunjin, on Korea's east coast, the USS
Juneau helps destroy three of four attacking North
Korean torpedo boats.
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July 5
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Battle of Osan. First U.S. ground action of the
war: Task Force Smith (406 infantrymen and 134
artillerymen) engages and delays advancing North
Korean People's Army (NKPA) units.
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July 6
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Fifty-seven Army nurses arrive in Pusan, Korea.
They helped establish a hospital for the wounded.
Two days later, on July 8, twelve Army nurses moved
forward with a mobile Army surgical hospital (MASH)
to Taejon.
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Aug. 4 -
Sept. 16
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16 84,478 U.S. troops participate in the defense
of the Pusan Perimeter, including the U.S. Army's
1st Cavalry Division, 2nd, 24th, and 25th Infantry
Divisions, and the 1st Provisional Marine
Brigade.
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Sept. 15
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Inchon Landing (Operation CHROMITE). U.S. and
allied forces land U.S. Marines and U.S. Army
troops at Inchon.
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Sept. 15-30
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Inchon Operation and Liberation of Seoul. U.S.
and allies re-capture Seoul on Sept. 27 after a
week of fighting.
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Sept. 16-27
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Pusan Perimeter breakout. Eighth U.S. Army
(EUSA) breaks out of the Pusan Perimeter. Four U.S.
divisions (1st Cavalry Division, 2nd, 24th and 25th
Infantry Divisions) participate.
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Oct 20
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War's first airborne operation. Seventy-one
C-119s and 40 C-47s of the Far East Air Force's
(FEAF) Combat Cargo Command drop 2,860 paratroopers
of the 187th Airborne Regimental Combat Team (RCT)
at Sukch'on and Sunch'on north of Pyongyang. Only
one trooper killed and 36 injured in jump.
Paratroopers, in association with ground forces
driving north, kill or capture about 6,000 North
Koreans during this operation.
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Oct. 25
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Chinese Communist Forces (CCF) launch their
first phase offensive of the Korean War.
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Nov. 8
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First all-jet combat in history. An F-80
Shooting Star of the 51st Fighter Interceptor Wing
shoots down a MiG-15 fighter near Sinuiju in a
30-second dogfight.
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Nov. 8-26
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FEAF B-29s and Navy aircraft attack Yalu River
bridges in attempt to isolate the battlefield.
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Nov. 25 -
Dec. 15
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CCF Counteroffensive in North Korea. Seven U.S.
divisions participate (1st Marine Division, U.S.
Army's 1st Cavalry Division, 2nd, 3rd, 7th, 24th
and 25th Infantry Divisions).
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Nov. 27 -
Dec. 9
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Battle of the Changjin (Chosin) Reservoir. The
encircled 1st Marine Division fights its way
southward from the Chosin Reservoir to the port
city of Hungnam.
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Dec. 24
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Hungnam Operation is completethe U.S.
Navy evacuates 105,000 U.S. and Republic of Korea
(ROK) forces.
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