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In page Battle of Guam (1944):

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Rain and thick jungle made conditions difficult for the Americans, but after an engagement with the main Japanese line of defense around Mount Barrigada from 2–4 August, the Japanese line collapsed.[1]:73–74 The 1st Provisional Brigade formed up on the left flank of the 3rd Marine Division on 7 August because of the widening front and continued casualties, in an effort to prevent the Japanese from slipping through the American gaps.[1]:75–76 The Japanese had another stronghold at Mount Santa Rosa, which was secured on 8 August.[1]:74,81