Kalma Peninsula was chosen as the point of assault, with two beaches, YELLOW and BLUE, marked off on the eastern shore. Ten high-ground objectives described the semicircular arc of the beachhead, which focused on Wonsan and fanned out as far as five miles inland. The 1st and 7th Marines were to hit YELLOW and BLUE Beaches, respectively and drive inland to their assigned objectives. The 5th, upon being ordered ashore, would assemble west of Wonsan, prepared for further operations. Two battalions of the 11th Marines were to land on call in direct support of the assault units, and the remainder of the artillery would initially function in general support. Other subordinate units drew the usual assignments. The Reconnaissance Company, after landing on order, was to screen the Division’s left flank by occupying specified objectives. Attached to the 1st and 7th Regiments respectively, the 5th and 3d Korean Marine Corps (KMC) Battalions would also go ashore on call.[46] [46] 1stMarDiv _OpnO 16-50_, 10 Oct 50. _ROK Army Captures Wonsan_ At 0815, 10 October, coincidentally with the publication of 1stMarDiv OpnO 16-50, troops of I ROK Corps, advancing rapidly up the east coast of Korea, entered Wonsan. By evening of the next day, the ROK 3d and Capital Divisions were mopping up minor resistance in the city and guarding the airfield on Kalma Peninsula.[47] [47] EUSAK _War Diary Summary_ (_WD Sum_), _Oct 50_, 14–16. Overland seizure of the 1st Marine Division’s amphibious objective did not come as a surprise either at GHQ in Tokyo or at General Smith’s CP aboard the _Mount McKinley_ in Inchon Harbor. General MacArthur had, in fact, prepared for this eventuality by considering an alternate assault landing at Hungnam, another major seaport, about 50 air miles north of Wonsan. On 8 October, therefore, the JSPOG completed a modified version of CinCFE OpnPlan 9-50. Eighth Army’s mission--the capture of Pyongyang--remained unchanged in this draft, but X Corps would now land “... in the vicinity of Hungnam in order to cut the lines of communications north of Wonsan and envelop the North Korean forces in that area.” Although the choice of a new objective seemed logical on the basis of the ROK Army’s accomplishment, certain logistical obstacles at once loomed in the path of the alternate plan. Not unaware of the most imposing of these, JSPOG commented: The harbor at Wonsan cannot accommodate at docks the large vessels lifting the 7th Division. Since most of the amphibious type boats are carried on ships lifting the 1st Marine Division, the plans for off-loading the 7th Division will have to be revised.[48] [48] CinCFE _OpnPlan 9-50_ (_Alternate_), 8 Oct 50.