The Guadalcanal campaign, also known as the Battle of Guadalcanal and codenamed Operation Watchtower by American forces, was a military campaign fought between 7 August 1942 and 9 February 1943 on and around the island of Guadalcanal in the Pacific theater of World War II. It was the first major land offensive by Allied forces against the Empire of Japan.

On 7 August 1942, Allied forces, predominantly United States Marines, landed on Guadalcanal, Tulagi, and Florida in the southern Solomon Islands, with the objective of using Guadalcanal and Tulagi as bases in supporting a campaign to eventually capture or neutralize the major Japanese base at Rabaul on New Britain. The Japanese defenders, who had occupied those islands since May 1942, were outnumbered and overwhelmed by the Allies, who captured Tulagi and Florida, as well as the airfield later named Henderson Field that was under construction on Guadalcanal.

Surprised by the Allied offensive, the Japanese made several attempts between August and November to retake Henderson Field. Three major land battles, seven large naval battles (five nighttime surface actions and two carrier battles), and almost daily aerial battles culminated in the decisive Naval Battle of Guadalcanal in early November, with the defeat of the last Japanese attempt to bombard Henderson Field from the sea and to land enough troops to retake it. In December, the Japanese abandoned their efforts to retake Guadalcanal, and evacuated their remaining forces by 7 February 1943, in the face of an offensive by the U.S. Army's XIV Corps, with the Battle of Rennell Island, the last major naval engagement, serving to secure protection for the Japanese troops to evacuate safely.

The campaign followed the successful Allied defensive actions at the Battle of the Coral Sea and the Battle of Midway in May and June, 1942. Along with the battles at Milne Bay and BunaGona, the Guadalcanal campaign marked the Allies' transition from defensive operations to offensive ones and effectively allowed them to seize the strategic initiative in the Pacific theater from the Japanese. The campaign was followed by other Allied offensives in the Pacific, most notably: the Solomon Islands campaign, New Guinea campaign, the Gilbert and Marshall Islands campaign, the Mariana and Palau Islands campaign, the Philippines campaign (19441945), and the Volcano and Ryukyu Islands campaign prior to the surrender of Japan in August, 1945.

Carlson's patrol, also known as The Long Patrol or Carlson's long patrol, was an operation by the 2nd Marine Raider Battalion under the command of Evans Carlson during the Guadalcanal Campaign against the Imperial Japanese Army from 6 November to 4 December 1942. In the operation, the 2nd Raiders attacked forces under the command of Toshinari Shōji, which were escaping from an attempted encirclement in the Koli Point area on Guadalcanal and attempting to rejoin other Japanese army units on the opposite side of the U.S. Lunga perimeter.

In a series of small unit engagements over 29 days, the 2nd Raiders killed almost 500 Japanese soldiers while suffering only 16 killed, although many were afflicted by disease. The raiders also captured a Japanese field gun that was harassing Henderson Field, the Allied airfield at Lunga Point on Guadalcanal.