On 7 August, word arrived that U.S. Marines had landed that morning on Guadalcanal. The initial Allied landings captured an airfield, later named Henderson Field by the Allies, that had been under construction by the Japanese. The airfield soon became the focus of months of fighting during the Guadalcanal Campaign, as it enabled U.S. airpower to hinder the Japanese attempts at resupplying their troops. The Japanese made several attempts to retake Henderson Field, resulting in continuous, almost daily air battles for the Tainan Kōkūtai.