In spite of its vulnerability, the Hook could not be abandoned. There was no other terrain feature held by the Marines that could command the critical Samichon Valley, a major avenue of approach from the northeast directly to Seoul. The salient also dominated the entire nearby area of the Imjin River to the south. Possession of the Hook and adjoining ridge would give the Communists observation of a substantial portion of the Marine rear areas beyond the Imjin, as well as the vital river crossings. In the opinion of Major General M. M. Austin-Roberts-West, whose 1st Commonwealth Division was soon to take over the Hook sector, had the salient been lost, “a withdrawal of 4,000 yards would have been necessary.”[257] [257] Quoted in LtCol Herbert F. Wood, _Strange Battleground: The Operations in Korea and Their Effects on the Defense Policy of Canada_ (Ottawa: The Army Historical Section, Canadian Forces Headquarters, 1966), p. 213. At the beginning of October, this vital area had been protected by COPs Seattle and Warsaw. When the former was overrun, it became necessary to establish a new position. This was directed by Lieutenant Colonel Dulacki, and on 16 October Ronson was established 200 yards southeast of Seattle and 275 yards west of the Hook. About 600 yards northeast of the salient the remaining position, COP Warsaw, commanded the lowlands to the east and the narrow, east-west oriented valley of a Samichon tributary immediately to the front. Opposite the three MLR battalions of the 7th Marines were the 356th and 357th Regiments of the 119th Division, 40th CCF Army. In addition to these infantry units, numbering close to 7,000, an estimated 10 battalions (120 guns) of Chinese artillery[258] were facing Colonel Moore’s regiment. Personnel strength of the American unit consisted of 3,844 Marines, 11 medical officers and 133 corpsmen, 3 U.S. Army communicators, and 764 Koreans (746 KSCs and 18 interpreters). [258] The Marine division artillery regiment reported that in late October nine battalions of Chinese artillery, ranging from 75 or 76mm guns or howitzers to 122mm howitzers, opposed the 7th Marines. It was estimated that one other 122mm battalion was also emplaced north of the right division sector. In addition to these CCF units, elements of a 152mm self-propelled howitzer unit were also believed to be in the area. Late in November two batteries of 152mm howitzers were tentatively located about 4,000 yards west northwest of the Hook. Disposition had been determined “as a result of crater analysis, shell reports, sound plots, and capabilities of the weapon.” 11thMar ComdD, Nov 52, “Enemy Artillery Activity Rpts,” Nos. 21, 23, dtd 1, 21 Nov. 52.