Allied troops got sick with dysentery soon after the landings, with one in five Marines sick by mid-August. Tropical diseases affected both sides' troops. Although some of the Korean construction workers surrendered to the Marines, most of the Japanese and Korean gathered to the west and ate coconuts. A Japanese naval outpost was also located at Taivu Point, about 35 kilometres (22 mi) east of the Lunga perimeter. On 8 August, a Japanese destroyer from Rabaul delivered 113 troops to the Matanikau position.