The
Guadalcanal Campaign, also known as the
Battle of Guadalcanal and
code-named Operation Watchtower, originally applying only to an operation to take the island of
Tulagi, by
Allied 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 offensive by
Allied forces against the
Empire of Japan.