(e) The 1st Provisional Marine Brigade was disengaged from active combat with the enemy on the South Korean front at midnight on 5 September, moved to Pusan, and outloaded in combat shipping in less than 7 days. (f) A successful assault landing was executed at Inchon, Korea, on 15 September under some of the most adverse landing conditions in the history of amphibious operations. (g) The Force Beachhead Line approximately six miles from landing beaches was seized within 24 hours after the main landing on Beaches RED and BLUE. (h) Kimpo Airfield, a primary objective of the operation in the 1st Marine Division’s zone of action, was captured 50 hours and 35 minutes after H-Hour, D-Day. (i) The first assault crossing of the Han River (400 yards wide at the crossing site) was executed by RCT-5, employing LVTs, DUKWs, and pontoon ferries, less than five days after landing at Inchon. (j) The remainder of the Division crossed the Han River without bridging, and after intense fighting completed the seizure of Seoul 12 days after landing at Inchon. (k) The effectiveness of the Marine air-ground team and close air support doctrine were reaffirmed with outstanding success. (l) The ability of Marine units to participate in extended land operations, provided additional transportation requirements are met during the emergency, was demonstrated in the Inchon-Seoul operation.[471] [471] O. P. Smith, _Notes_, 365–366. In any such summary, it is understood that credit for the accomplishments of the 1st Marine Division was shared by the 1st Marine Aircraft Wing. Two more days of fighting remained for the squadrons at Kimpo after the relief of the ground forces, since Marine air operations cover the period from 7 September to 9 October 1950. Altogether, 2,774 combat sorties were flown by the five Marine squadrons during this 33-day period, most of them in close support of infantry units. Following are the totals: --------------+--------+---------- Squadron | Days in| Combat | Action| Sorties --------------+--------+---------- VMF-214 | 16 | 484 VMF-323 | 22 | 784 VMF-212 | 19 | 607 VMF-312 | 10 | 288 VMF(N)-542 | 19 | 573 | +---------- Total | |[472]2,774 --------------+--------+---------- [472] Summaries and statistics for Marine air have been derived form: 1st MAW _SAR_, Annexes Able, Item, Jim, Queen, Sugar; also E. H. Giusti and K. W. Condit, “Marine Air over Inchon-Seoul,” _Marine Corps Gazette_, 36, no. 6 (Jun 52): 19–27.