On 7 August 1942, the First Marine Division landed on Tulagi and Guadalcanal at Lunga Point, capturing the partially completed Japanese airfield and marking the first counter-offensive taken by the Allies in the Pacific Theater. More construction work began on the airfield immediately, mainly using captured Japanese equipment. On 12 August, the airfield was renamed Henderson Field, for Major Lofton R. Henderson, who was killed during the Battle of Midway and who was the first Marine Corps pilot killed during the battle. By 18 August, Henderson Field was ready for operation.