The Marine Corps mourns the passing of the prime author of this series and other admirable works of Marine Corps and military history. Lynn Montross, after a lengthy illness, died on 28 January 1961. [Illustration: (signature)] H. W. BUSE, JR. _Brigadier General, U. S. Marine Corps,_ _Assistant Chief of Staff, G-3._ Contents _Page_ I Interlude at Masan 1 Return to the Bean Patch--1st Marine Division in EUSAK Reserve--General Ridgway New EUSAK Commander--Ridgway’s Declaration of Faith--Marine Personnel and Equipment Shortages--Marine Air Squadrons in Action--The Air Force System of Control--X Corps Conference at Kyongju II The CCF January Offensive 21 UN Forces Give Ground--Further Eighth Army Withdrawals--Marine Aircraft in the Battle--1st Marine Division Assigned Mission--Replacements by Air and Sea--The Move to Japanese Airfields--Red China’s “Hate America” Campaign--A Tactical Formula for Victory III The Pohang Guerrilla Hunt 41 The New Marine Zone of Operations--1st MAW Moves to Bofu--Marine Rice Paddy Patrols--Operations THUNDERBOLT and ROUNDUP--Action in the Pohang-Andong Zone--KMC Regiment Joins 1st Marine Division--10th NKPA Division Scattered--New Mission for the Marines IV Operation KILLER 59 The Move to the Chungju Area--Marine Planes in Action--Planning for the New Operation--The Jump-Off on 21 February--Stiffening of Chinese Resistance--General Smith in Command of IX Corps--The Advance to Phase Line ARIZONA--JOC Air Control System Criticised V Operation RIPPER 79 Light Resistance the First Day--Seoul Abandoned by Enemy--Second Phase of the Operation--Changes in 1st MAW Units--General MacArthur Visits Marine Battalion--1st KMC Returns to Division--38th Parallel Recrossed by Marines--Renewal of Division’s CAS Problems VI The CCF Spring Offensive 99 Prisoners Reveal Date of Offensive--Hwachon Occupied by KMC Regiment--CCF Breakthrough Exposes Marine Flank--Marine Air in Support Everywhere--Plugging the Gap on the Marine Left--Repulse of Communist Attacks--Withdrawal to the KANSAS Line--Enemy Stopped in IX Corps Sector--1st Marine Division Returns to X Corps VII Advance to the Punchbowl 127