On 7th August 1942, Rear Admiral Frank Fletcher provided the back-up support that enabled General Alexander Vandegrift and 19,000 US Marines to land on Guadalcanal, Gavutu and Tulagi. It was the first time that the Navajo Code Talking was used.
The Japanese garrison of 4,000 held out for two days on Tulagi. Progress was slower on Guadalcanal and despite attempts by the Japanese Army, Japanese Navy and Japanese Air Force, the US Marines were able to stay and build the Henderson Field airstrip.
The US Marines managed to withstand continuous attacks including the battles of Tenaru River (21st August) and Bloody Ridge (12th September).Another 20,000 Japanese soldiers were landed on Guadalcanal and this led to a renewed offensive at Matanikau River on 23rd October.
In October, 1942, TG 16 (Enterprise) and TG 17 (Hornet) were combined to form TG 61 and was placed under the command of Rear Admiral Thomas Kinkaid . He faced Nobutake Kondo at the battles that took place at Santa Cruz Islands (26th-27th October, 1942). During the battle Hornet was sunk and the Enterprise was severely damaged. However, the Japanese Navy had greater difficulty replacing her losses and found it difficult to provide supplies to the Japanese Army in the region.
Admiral William Halsey took control of naval operations during the Guadalcana campaign (12th-13th November, 1942) and sunk two Japanese battleships, two destroyers and six transport ships for the loss of two cruisers and four destroyers.
General Alexander Vandegrift, who was awarded the Navy Cross and the Medal of Honor, for his achievements on Guadalcanal, was relieved by General Alexander Patch and the 14th Corps in December 1943. It is estimated that the Japanese Army lost more than 25,000 men during the struggle for the Solomons Islands.