[207] As the military situation changed in Korea to become increasingly one of a battle of position and attrition, the Marine Corps Basic School, Quantico, Va. curriculum was revised to give greater emphasis to tactics of positional warfare. Close attention was paid to terrain evaluation, employment of infantry units, offensive and defensive use of automatic and supporting weapons, night counterattacks, field problems of reverse slope defense, and even tasks of “research into WW I--and the American Civil and Revolutionary Wars for the tactic of Reverse Slope defense.” _Armitage ltr._ Tank, artillery, air, and ground Marines participating in the battle of Bunker Hill gave up one outpost but took another, one that added strength not only to the outpost defense but also to the main line. A well thought-out plan and its skillful execution permitted Marines to take the critical terrain quickly without crippling casualties. Defense of the position on Hill 122 was complicated not so much by the Chinese infantry action but by the intensive mortar and artillery shelling. The Marines’ capability to defend was enhanced by close coordination among artillery, air, and tank units. Chinese casualties, by estimate, were 500 percent more than the losses actually suffered by the Marines. The battle of Bunker Hill resulted in the first major Marine action and victory in West Korea. It ushered in two straight months of hard fighting, the most difficult ones yet for Marines on the western front. CHAPTER IV Outpost Fighting Expanded _From the Center Sector to the Right--Early September Outpost Clashes--Korean COPs Hit Again--More Enemy Assaults in Late September--Chinese Intensify Their Outpost Attacks--More PRESSURE, More CAS, More Accomplishments--Rockets, Resupply, and Radios_ _From the Center Sector to the Right_[208] [208] Unless otherwise noted, the material in this section is derived from: 1stMarDiv ComdD, Aug 52; 1stMarDiv PIRs 661–675, dtd 18–31 Aug 52; 1stMar, 5thMar, 2/1, 3/1 ComdDs, Aug 52. Following the progressively faltering Chinese attacks against Bunker Hill in mid-August, the 1st Marines in the center MLR sector witnessed a period of decreased enemy activity. By sunup on the 17th, Captain Ksycewski’s Company C, from Lieutenant Colonel King’s 1st Battalion had relieved B/1/1, marking the second complete tour of duty at Hill 122 for Company B that month. In two days on the shell-torn crest, Company C received only a single enemy probe and only a few rounds of artillery and mortar fire. In the early morning hours of the 19th, D/2/1 assumed responsibility for Bunker and Hill 124. These new occupants of the disputed property almost immediately were subjected to larger and more frequent Chinese probes as well as increased fire from CCF supporting weapons.