Division OpnO 25-51 assigned the 5th Marines the mission of passing through 3/1 in the vicinity of Hill 751 and attacking to secure Objective DOG, the bare, brown hill mass which loomed approximately 1,000 yards ahead. The last few hundred yards were certain to be long ones, for the main east-west ridgeline leading to Hill 812 was crossed by a north-south ridgeline--the leg and head of another “T” formation. Again, as on Hill 749, the attackers had to fight their way through a vicious crossfire. Lieutenant Colonel Houston Stiff’s 2/5 on the right had the main effort. The 3d Battalion, 5th Marines (Lieutenant Colonel Donald R. Kennedy) was to advance on Stiff’s left with the mission of supporting his attack on Objective DOG, prepared to seize Hill 980 on order. Lieutenant Colonel William P. Alston’s 1/5 remained in regimental reserve.[291] [291] Sources for this section, unless otherwise specified are as follows: 1stMarDiv _HD_, Sep 51, 19–23; 5thMar _HD_, Sep 51, 14–19; 1st, 2d, and 3dBn, 5th Mar, _HD_, Sep 51; LtCol Houston Stiff, interv of 25 Jun 58; Maj G. P. Averill, “Final Objective,” _Marine Corps Gazette_, vol. 40, no. 8 (Aug 56), 10–16. Fox Company spearheaded the 2/5 attack by moving initially up the low ground between Hill 673 on the right hand and 680 on the left. Owing to delays in completing the relief of 1st Marines elements, it was early afternoon on 16 September before the assault got underway. Progress was slow against heavy mortar and machine gun fire, and a halt came at 1700 for regrouping and evacuation of casualties. Dog Company, in support on the ridge to the left, sighted troops approaching the objective and requested that the positions of the assault company be identified. In order to pinpoint the locations, a white phosphorous grenade was used as a mark. It attracted the attention of aircraft summoned by 3/5 against Hill 980 (Map 17), from which fire had been received. The planes, assuming that another target had been designated, attacked the forward platoons of Fox Company with napalm and machine guns. By a miracle, recognition panels were put out before a single casualty resulted, but the men found it a harrowing experience. Darkness fell before the attack could be resumed, and Fox Company pulled back along the ridgeline to set up a perimeter defense and evacuate the wounded. The night passed without enemy action. Bright moonlight made for unusual visibility which discouraged enemy attacks and permitted the Marine assault platoons more sleep than might otherwise have been expected.