On July 21, 1944, around 0830, 3rd Battalion hit the Asan beaches on Guam. Landing on the extreme left of the entire 3rd Marine Division, their mission was to take Chonito Cliff and Adelup Point, which marked the left flank of the division. Within minutes the Japanese defenders opened up with mortars and machine guns, hitting many 3rd Battalion Marines coming ashore. By 0912 battalion commander LtCol Ralph Houser reported many casualties caused by both mortars and sniper fire. Both Kilo and India Companies rushed the Chonito Cliffs but the Japanese defenders (Elements of the 2d Battalion, 18th Regiment and 320th Independent Infantry Battalion) resisted strongly, in some cases rolling grenades down the hillside. Supported by flamethrowers, half-tracks, and armor from the 3rd Tank Battalion, 3rd Battalion fought a bloody, three-hour battle up the side of Chonito Cliff. Houser then ordered Lima Company to flank the cliffs to the north by dashing down an exposed beach road. Having secured Chonito Cliff, the battalion then moved on to Adelup Point. The US Navy sent a destroyer to blast the Japanese caves at point-blank range and 3rd Battalion flamethrowers burned out Japanese soldiers who still remained. After securing Adelup Point, 3rd Battalion finished the day providing flank security for the rest of the 3rd Marines during the Battle for Bundschu Ridge and became the only unit in the regiment to accomplish its objectives by the end of W-Day.
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