The 3d Battalion, 5th Marines, had arrived from the east coast of the Chosin Reservoir at noon on the 27th, while the attacks to the west were in full progress. Lieutenant Colonel Taplett placed his unit in an assembly area at the base of North Ridge, beneath the large, unoccupied spur leading to Hill 1384. The 1st Battalion, 5th Marines, did not complete its move to Yudam-ni from the east side of the reservoir until after dark. Lieutenant Colonel John W. Stevens, II, secured for the night in the valley below Hills 1282 and 1240; and with Taplett’s nearby command, 1/5 thus comprised a formidable reserve behind the thin high-ground defenses of Companies D and E of 2/7. To the left of North Ridge, going round the clock, Company H of 3/7 dug in on the crest of Hill 1403, terminal height of Northwest Ridge. Farther to the left, in the broad draw through which Company F had earlier enveloped the CCF-held spur, Company E of 2/5 took up strong blocking positions. The latter unit was not tied in with the 7th Marines’ troops on Hill 1403, there being a steep and rugged gap of about 200 yards on the intervening hillside. Easy Company’s line extended up the left side of the draw and connected with Fox’s on the northern tip of the newly won spur. Company F manned the remainder of that finger of high ground, its left flank overlooking the road separating Southwest Ridge. As mentioned before, Company D, 2d Battalion, 5th Marines, occupied a finger of Southwest Ridge jutting out toward the road and directly opposite Fox Company’s spur. To the left, but beyond physical contact, Companies G and I of the 3d Battalion, 7th Marines, defended the topographical crest of Southwest Ridge. As an example of altitudes and distances involved around the perimeter, the latter company, perched atop Hill 1426 (meters), sat 1200 feet above the valley floor at Yudam-ni[382] and at a lineal distance of a mile and a half from the village. To its left rear, 2000 yards away on the same hill mass, Company A of 1/7 defended a terminal peak, Hill 1294, overlooking the broad valley separating South Ridge. A platoon of Company C, 1/7, was deployed on the valley floor to block that avenue into Marine artillery positions. [382] Yudam-ni itself is 3500 feet above sea level. South Ridge, capped by a conical peak jutting 1600 feet skyward, points at Yudam-ni and the reservoir like a great arrowhead. Company B of 1/7, after returning from the active patrol mentioned earlier, entrenched on the tip, Hill 1276, to cover the deep gorge between South and Southeast Ridges. In this narrow ribbon of low ground, the MSR from Yudam-ni travels southward four miles before turning abruptly east into Toktong Pass. Company C of 1/7, less one platoon, occupied a spur of Southeast Ridge near the sharp turn--three miles from the Valley of Yudam-ni and five from the village itself.