General Obata reported, "our forces failed to achieve the desired objectives." Takashina was killed on 28 July, and Lieutenant General Hideyoshi Obata took over the command of the Japanese defenders. On 28 July, the two beachheads were linked, and by 29 July, the Americans secured the peninsula. The Japanese counterattacks against the American beachheads, as well as the fierce fighting, had exhausted the Japanese. At the start of August, they were running out of food and ammunition, and they had only a handful of tanks left. Obata withdrew his troops from southern Guam, planning to make a stand in the mountainous central and northern part of the island, "to engage in delaying action in the jungle in northern Guam to hold the island as long as possible". After ensuring that no significant Japanese forces operated in the southern portion of Guam, Marine Major General Geiger started an offensive north with the 3rd Marine Division on the left flank and the 77th Infantry Division on the right, liberating Agana on the same day. The Tiyan Airfield was captured on 1 Aug. 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. 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. The Japanese had another stronghold at Mount Santa Rosa, which was secured on 8 August. On 10 August, organized Japanese resistance ended, and Guam was declared secure, but 7,500 Japanese soldiers were estimated to be at large. The next day, Obata committed ritual suicide at his headquarters on Mount Mataguac after he had sent a farewell message to Japan. Aftermath A few Japanese soldiers held out in the jungle after the fighting on Guam. On 8 December 1945, three U.S. Marines were ambushed and killed. Sergeant Masashi Itō surrendered on 23 May 1960, after the last of his companions was captured. On 24 January 1972, Sergeant Shoichi Yokoi was discovered by hunters on the island. He had lived alone in a cave for 28 years, near Talofofo Falls. Guam was turned into a base for Allied operations after the battle. 5 large airfields were built by the Navy Seabees and