Immediately to the front of the 22d Marines was the infernal mangrove swamp from where the _banzai_ attack had been mounted the night before. It was still manned heavily by Japanese, was dense, and the only means of penetrating it was by a 200-yard-long corridor along the regimental boundary which was covered by Japanese enfilade fire and could only be navigated with the cover of tanks. The armor gunners and commanders directed their fire just over the head of prone Marines and into the gunports of enemy pillboxes. By 1245, Colonel Schneider’s regiment had worked its way through all bottlenecks past the mangrove swamps, destroying bunkers with demolitions and flamethrowers. The 4th’s assault battalions kept pace with this advance, finding somewhat easier terrain but just as determined defenders. By evening the brigade had advanced 1,500 yards from its jump-off line. Both regiments, weary, wary, and waiting, dug in with an all-around defense.
Again, there was a heavy pre-attack barrage on the 27th and the Marines were stopped again before they’d gone 100 yards. The 3d Battalion, 4th Marines, facing a well-defended ridge, a coconut grove, and a sinister clearing, was nearing the sentimental and tactically important goals of the old Marine barracks, its rifle range, and the runways of Orote airfield. With heavy tank support, the 22d Marines surged forward past the initial obstacles and by afternoon had reached positions well beyond the morning’s battles. On the left of the 4th Marines, where resistance was lighter, the assault was led by tanks that beat down the brush. While inspecting positions there, Lieutenant Colonel Samuel D. Puller, the 4th’s executive officer and brother of famed Lieutenant Colonel Lewis B. “Chesty” Puller, was killed by a sniper.
By mid-afternoon, the 4th Marines’ assault elements broke out of the grove just short of the rifle range, only to stall in a new complex at dug-in defenses and minefields. Strangely, and yet not unusual in the climax of a losing engagement, a Japanese officer emerged to brandish his sword at a tank. It was easier than ritual suicide.
The horror of the American guns again must have been too much for the Japanese defending the immediate front. Surprisingly, they just cut and ran from their strong, well-defended positions. The elated Marines, who did not care why the enemy ran--just that they ran--now dug in only 300 yards from the prized targets. Their capture would wait for tomorrow, 28 July. The Japanese were now squeezed into the last quadrant of the peninsula. All of their strongly entrenched defenses had failed to hold. The Orote airfield, the old Marine barracks, the old parade ground which had not felt an American boot since 10 December 1941, were all about to be retrieved.