Which WWII campaign is known as the first major Allied offensive in the Pacific?

• A. Guadalcanal Campaign
• B. Battle of Midway
• C. Battle of Leyte Gulf
• D. Battle of Coral Sea

Answer: (A)

The key idea here is identifying when the Allies first took the initiative with a substantial land operation against Japan in the Pacific. The Guadalcanal Campaign fits this best because it was the first sustained Allied ground offensive to seize occupied territory in the Pacific.

In August 1942, American forces landed on Guadalcanal to seize an airfield that could threaten Japanese supply routes and protect Australia. This campaign required a true combined effort—land combat by Marines and Army units, supported by a naval blockade and air power—and it lasted for several months, with fierce fighting on land around Henderson Field and crucial naval actions at sea. The eventual outcome was the Japanese decision to withdraw most of their forces by early 1943, but the campaign’s significance lies in switching the Allies from a strictly defensive posture to an ongoing, offensive push that would continue across many islands.

Coral Sea, by contrast, was mainly a defensive/containment action designed to stop a Japanese move toward Australia rather than a ground assault on captured territory. Midway was a decisive naval victory that checked Japanese expansion and shifted momentum, but it did not involve a sustained Allied land campaign. Leyte Gulf occurred later, as part of the campaign to liberate the Philippines.