Since 5 October when 1/7 had been moved into the line as the regiment’s third MLR battalion, the enemy had begun a regular shelling of 1/7 positions adjacent to the Hook. Incoming rounds had increased almost daily. “Troops, vehicles, and tanks moving in daylight even behind the MLR almost invariably brought down enemy artillery or mortars upon them. It was apparent that the enemy was making preparation for a large scale assault in this portion of the MLR,”[271] the battalion commander, Lieutenant Colonel Dulacki, later recalled. Matters took an even more ominous turn about 23 October when the Chinese “began a deliberate, deadly accurate precision fire aimed at destruction of the major fortifications in the Hook’s system of dug-in defense.”[272] As the tempo of this fire stepped up daily, the destruction of the battalion’s carefully prepared defenses exceeded the Marines’ ability to repair the damage. The artillery build-up was believed preparatory to an attempt to either seize or breach the MLR. [271] _Dulacki ltr._ [272] Heinl, _memo_. In late October, Lieutenant Colonel Dulacki had two companies on the MLR to protect this important area. On the 23d, Captain Frederick C. McLaughlin’s Company A was assigned the left part of the battalion sector, which included the Hook. A squad outposted Ronson and a reinforced platoon was stationed at Warsaw. At 0200 on the 26th, Company C (Captain Paul B. Byrum) departed the battalion reserve area to take over responsibility as the left MLR company. Relief of Company A was completed at 0410.[273] Holding down the right flank of the main line during this time was Company B (Captain Dexter E. Evans). This area was larger but somewhat less rugged than the western part of the 1/7 sector. [273] Due to the width of the Hook sector, it was necessary to keep all three rifle platoons in the line. A reinforced platoon from the battalion reserve outposted Warsaw. While Company A was on line, a Company C platoon manned the outpost; when Company C was relieved on 26 October, a Company A platoon was sent to Warsaw. Maj Frederick C. McLaughlin ltr to Dir, MCHist, HQMC, dtd 27 Jan 70, hereafter _McLaughlin ltr_.