_The Quiet Sectors_[331] [331] Unless otherwise noted, the material in this section is derived from: KPR ComdDs, Jun, Aug, Oct-Dec 52, Jan-Mar 53; 1st AmTracBn ComdDs, Mar-Dec 52, Jan-Mar 53. Two frontline units in the division MLR seldom became involved in setting records or bitter contests with the enemy, even though they carried out important roles in the sector defense. These were the Kimpo Provisional Regiment and 1st Amphibian Tractor Battalion, both located on the left flank of the Marine line. The Kimpo Provisional Regiment had been organized as a component of the 1st Marine Division a week after its arrival in the west, specifically for defending that vital sector at the extreme left of the UNC line. The next month the 1st Amphibian Tractor Battalion had been assigned part of Line KANSAS between the KPR and KMC sectors. Because it was set apart from the Korean mainland on the north and east by the Han River,[332] Kimpo Peninsula afforded little opportunity for its occupants to engage the enemy directly in infantry clashes. Artillery thus became the normal medium for carrying on the limited hostilities as they existed in this sector between the Communists and UNC opponents. Hostile forces opposing the KPR were deployed in company-sized strongpoints across the river, occupying numerous fortified heights on the north bank of the Han estuary. Enemy strength[333] was estimated to be 7 infantry companies, supported by 7 artillery batteries and 40 mortar positions. Sporadic mortar and artillery rounds fell in the sector, with little harm. Occasionally, enemy counterbattery fire caused minor damage to the LVTs of the command. During 1952, the first year of the existence of the Kimpo regiment, 15 June had stood as the record day for the number of enemy artillery rounds received. Between 1900–2100 a total of 588 shells had fallen in the sector. [332] On the west, the Yom River similarly separates the Kimpo Peninsula from Kanghwa-do Island, second in size of all Korean islands and a base for friendly intelligence operations. [333] Identified as elements of the 195th CCF Division of the 65th CCF Army and an unidentified CCF division, in a revised EOOB issued in December. Previously, units of the 193d CCF Division were at the front in this far western sector. KPR ComdDs, Oct-Dec 52.