attacks. This persisted for the months of August and September, 1942. The presence of Admiral Scott's task force at Cape Esperance represented the U.S. Navy's first major attempt to wrest night time operational control of waters around Guadalcanal away from the Japanese. The first attempt by the Japanese Army to recapture Henderson Field was on 21 August, in the Battle of the Tenaru, and the next, the Battle of Edson's Ridge, from 12–14 September; both failed. The Japanese set their next major attempt to recapture Henderson Field for 20 October and moved most of the 2nd and 38th infantry divisions, totalling 17,500 troops, from the Dutch East Indies to Rabaul in preparation for delivering them to Guadalcanal. From 14 September to 9 October, numerous Tokyo Express runs delivered troops from the Japanese 2nd Infantry Division as well as Hyakutake to Guadalcanal. In addition to cruisers and destroyers, some of these runs included the seaplane carrier , which delivered heavy equipment to the island including vehicles and heavy artillery other warships could not carry because of space limitations. The Japanese Navy promised to support the Army's planned offensive by delivering the necessary troops, equipment, and supplies to the island, and by stepping up air attacks on Henderson Field and sending warships to bombard the airfield. In the meantime, Major General Millard F. Harmon—commander of United States Army forces in the South Pacific—convinced Vice Admiral Robert L. Ghormley—overall commander of Allied forces in the South Pacific—that the marines on Guadalcanal needed to be reinforced immediately if the Allies were to successfully defend the island from the next expected Japanese offensive. Thus, on 8 October, the 2,837 men of the 164th Infantry Regiment from the U.S. Army's Americal Division boarded ships at New Caledonia for the trip to Guadalcanal with a projected arrival date of 13 October. To protect the transports carrying the 164th to Guadalcanal, Ghormley ordered Task Force 64 (TF 64), consisting of four cruisers (, , , and ) and five destroyers (, , , , and ) under U.S. Rear Admiral Norman Scott, to intercept and combat any Japanese ships approaching Guadalcanal and threatening the convoy. Scott conducted one night battle practice with his ships on 8 October, then took station south of Guadalcanal near Rennell Island on 9 October, to await word of any Japanese naval movement toward the southern Solomons. Continuing with preparations for the October offensive,