In the center of Puller’s zone, the 1st Battalion had moved rapidly to fill the gap between the 2d and 3d. Attacking into the vacuum left by the retreating enemy, Hawkins’ unit drove two mountainous miles beyond the O-3 Line, finally stopping for the night on high ground about 2,500 yards south of 2/1’s positions on Hill 186. The break in the regimental front was protected when 3/1 shifted northward and formed a reserve perimeter to the rear of the lines, after being relieved on the right at 1700 by Captain Kenneth J. Houghton’s Reconnaissance Company. Assuming responsibility for the Division’s southern flank, the Recon troops set up a night defense at the base of the Namdong Peninsula with their front linked to that of 1/1 on the left.[207] [207] Recon Co, HqBn, 1st MarDiv _Unit Rpts_, 9 Sep-11 Nov 50; and Ridge ltr, 12 May 55. _Displacement Ashore of Division CP_ The establishment of a Division CP on shore was delayed by the necessity of utilizing every minute of the limited periods of high tide for the movement of troops, supplies, and equipment. General Smith decided on D-day that it would not be advisable to displace his CP ashore until General Craig and the ADC group (former headquarters of 1st ProvMarBrig) were able to set up adequate communications. With this object in mind, the ADC group landed on the evening high tide of D-day to locate an advance echelon on Wolmi-do. Not much could be done that evening. And in the morning Craig informed CG 1st MarDiv that the island was too crowded. He reported that he and Lieutenant Colonel Stewart had discovered a likely spot on the southeast outskirts of Inchon and recommended that the CP be moved without delay.[208] General Smith approved and the move started at once. [208] BGen E. W. Snedeker ltr to authors, 5 Apr 55. Meanwhile, a good deal of military housekeeping had been accomplished in the Inchon port area. Lieutenant Colonel John H. Partridge’s 1st Engineer Battalion was given the task of making a survey of beach exit roads with a view to opening up an MSR between RED and BLUE Beaches. After elements of Company A hit GREEN Beach, the remaining troops of the battalion had landed on the two beaches and assisted shore party units at unloading water, ammunition, and rations. This work was so well along by the morning of D-plus 1 that the engineers opened up the MSR between the two beaches and assigned personnel for improvement and maintenance. A Water point was established at the north end of RED Beach with 31 distillation units, and 125,000 gallons were issued during the next six days.[209] [209] 1st MarDiv _SAR_, Annex Nan Nan. The new Division CP on the outskirts of Inchon was ready by the afternoon of D-plus 1, and General Smith said goodbye to General MacArthur on the bridge of the _Mount McKinley_. The commander in chief wished him well and enjoined him to take Kimpo Airfield at the first opportunity.[210]