Raymond A. Spruance

Recorded sideUnited States

Recorded resultvictory at severe cost

U.S. forces captured the island after 36 days of fighting, but it was among the bloodiest battles of the Pacific and the only major action where American casualties exceeded Japanese.

Kuribayashi's defense-in-depth made the battle hugely costly: he refused the traditional beachfront defense and suicidal banzai charge, instead fighting from interlocking tunnels and concealed artillery, forcing the Marines to dig out each position under fire. Though the garrison was ultimately destroyed, it achieved a defensive 'success' measured in the blood it extracted even in defeat.

What followed

Demonstrated the extreme cost of assaulting a well-prepared island defense and influenced later strategic thinking about invading the Japanese home islands.

Recorded sideAllies (United States, United Kingdom)

Recorded resultvictory at heavy cost

The largest amphibious assault of the Pacific War and the last major battle; the island was secured after nearly three months of fighting marked by mass kamikaze attacks on the fleet.

As at Iwo Jima, the Japanese fought a defense-in-depth from fortified ridgelines and caves rather than contesting the beaches, extracting maximum attrition, while mass kamikaze strikes savaged the offshore fleet. The Allies prevailed through sustained firepower, naval-air dominance, and logistics, but at a cost that weighed heavily on planning for an invasion of the home islands.

What followed

The staggering casualties on both sides, including massive civilian loss, factored into the decision to use atomic weapons rather than invade Japan directly.