Why Iwo Jima Mattered

By early 1945, American forces in the Pacific were pushing relentlessly toward the Japanese home islands. Iwo Jima — a small volcanic island roughly 660 miles south of Tokyo — was strategically critical. Its airfields could support American bombers and their fighter escorts on raids over Japan, and its capture would deny Japan a key early warning radar station and intercept base.

What planners anticipated would take roughly five days turned into 36 days of some of the most ferocious close-quarters combat in the history of modern warfare.

The Island and Its Defenses

Iwo Jima is roughly eight square miles of volcanic rock, black sand beaches, and sulfurous terrain dominated by Mount Suribachi at its southern tip. Japanese General Tadamichi Kuribayashi had transformed the island into a fortified underground network: more than 11 miles of tunnels, hundreds of blockhouses, pillboxes, and concealed artillery positions.

Kuribayashi abandoned the traditional beach defense strategy. Instead, he ordered his roughly 21,000 troops to let the Americans land and then draw them into a grinding war of attrition from prepared underground positions. The strategy was brutally effective.

The Assault: February 19, 1945

Operation Detachment began with an amphibious landing by the U.S. Marine Corps on February 19, 1945. The initial landing was eerily quiet — and then the Japanese opened fire. Marines were caught in withering crossfire on the beaches, with little cover on the sloped black volcanic ash that made movement exhausting.

Progress was measured in yards. Each cave, tunnel entrance, and fortified position required direct assault — often by flamethrowers and demolitions teams working at lethal range. Marine casualties mounted rapidly.

Raising the Flag on Suribachi

On February 23, 1945 — just four days into the battle — a Marine patrol reached the summit of Mount Suribachi and raised an American flag. A second, larger flag was raised shortly after, and Associated Press photographer Joe Rosenthal captured the moment. That photograph became one of the most reproduced images in history and later inspired the Marine Corps War Memorial in Washington, D.C.

Despite the iconic image, the battle was far from over. The fight for the northern plateau and airfields would continue for another month.

The Cost of Victory

The battle officially ended on March 26, 1945. The human cost was staggering:

  • Nearly 7,000 U.S. Marines and Navy personnel were killed
  • More than 19,000 were wounded
  • Of approximately 21,000 Japanese defenders, fewer than 1,100 survived
  • 27 Medals of Honor were awarded for actions on Iwo Jima — the most for any single battle in American history

Fleet Admiral Chester Nimitz summarized the battle with words that have endured: "Among the Americans who served on Iwo Jima, uncommon valor was a common virtue."

Legacy and Memory

The Battle of Iwo Jima remains a defining moment in Marine Corps identity. It demonstrated the extraordinary courage of ordinary young Americans under unimaginable conditions. The airfields captured at such great cost were used by hundreds of B-29 crews who made emergency landings there during raids on Japan.

Today, the island is part of Japan (returned in 1968) and remains a solemn site of remembrance. Annual joint U.S.-Japanese memorial services reflect the long journey from enemies to allies — and honor all who fought and died on its shores.