Only Approximate Form Lines Shown
Meanwhile, heavy Seventh Air Force bombing as well as artillery and naval shelling of enemy areas had been going on for days. Night fighters were now assigned to support the advance, so even darkness afforded the Japanese no protection. By that same 6 August, the defense line that General Obata had set across Guam had been shattered and overrun. Only isolated pockets now existed before Santa Rosa.
No American commander could say on 7 August when the fight for Guam would be over. General Bruce in his attack first to Yigo and then Santa Rosa would have a relatively fresh regiment, the 306th, which had come up from the south where it had patrolled with the brigade. It was in contact with the 9th Marines on the division boundary. Colonel Douglas C. McNair, 77th Division chief of staff, was there, too, seeking a site for a division CP and was killed by a sniper. Colonel McNair’s father, Lieutenant General Leslie J. McNair, was killed in France 12 days earlier during an American bombing raid.
The attack on Mount Santa Rosa began at noon, 7 August. Behind the rumble of artillery and rattle of tanks, answered in kind by the enemy, the 77th took Yigo, the door to Santa Rosa, and continued General Bruce’s wheeling maneuver. Bulldozers blazed trails, and tanks and infantry overran machine gun positions. The 77th was dug into positions on the night of 7–8 August ready for the final attack on the mountain. The expected big Japanese counterattack still did not come. The rapid advance of the Americans accompanied by heavy artillery support likely forestalled that forelorn hope.
Sherman tanks of the Army 706th Tank Battalion pass through Agana before taking the cross-island road to join the 77th Division prior to the Barrigada action.
Two regiments, the 305th and 307th, proceeded rapidly on 8 August. By 1240, the northern half of Mount Santa Rosa was in American hands, and the troops moved to secure the rest of the mountain. By 1440 the Army had reached the cliffs by the sea and could look right down to the ocean. The 306th infantry had also completed an enveloping move to take the northern slopes of Mount Santa Rosa.
Only 600 enemy bodies were found after the two-day fight for Yigo and Santa Rosa. Yet, estimates of the enemy personnel at Santa Rosa had been as high as 5,000. So this meant that enemy troops in significant number now infested the jungled terrain everywhere on Guam. Worse, some enemy tanks were also unaccounted for. Enemy survivors of the Mount Santa Rosa battle kept drifting into the 9th Marines lines on the Army flank, slowing the regiment’s advance. Sharp-eyed Marines noted more than a smattering of enemy movement near a particular hill in the Army zone. This was believed to be the command post area of General Obata.
The 3d Marines on the left of the division’s zone had progressed with the same occasional enemy opposition. A 19-man roadblock held up the Marines, but was taken out quickly. Searching a corridor between the 3d and the 9th Marines, the 21st Marines came upon the bodies of 30 Guamanians near Chaguian. They had been beheaded.
The brigade had it a little easier on the far west, for it found negligible resistance as it advanced along fairly good trails. On 8 August, a patrol of the 22d Marines reached Ritidian Point, the northernmost point of the island. Moving along a twisting cliff trail to the beach, the Marines encountered less-than-aggressive Japanese defenses which they quickly overcame. General Shepherd’s 1st Provisional Marine Brigade had the distinction of being first to reach both the southernmost point of the island in the early days of the campaign and the northernmost section of Guam at Ritidian Point at this time.