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Battle of Iwo Jima
February 19 – March 26, 1945· Battle· Asia & Pacific
Well documentedSolid records, physical evidence or scientific consensus.
A five-week US Marine assault in 1945 on a small, heavily fortified volcanic island about 1,200 km south of Tokyo.
See it on the Battles & Wars map →What happened
The US wanted Iwo Jima's airfields for fighters escorting B-29 bombers to Japan and as an emergency landing site. General Tadamichi Kuribayashi's roughly 21,000 defenders dug miles of tunnels and bunkers and avoided wasteful charges. Marines landed February 19, 1945; on February 23 they raised the flag on Mount Suribachi, captured in a famous photograph. Fighting lasted until March 26. Nearly all the defenders died; about 6,800 Americans were killed and about 20,000 wounded.
Why it matters
One of the few Pacific battles where total US casualties exceeded Japanese ones, it foreshadowed the cost of invading Japan itself.
How we know
US Marine Corps records, Japanese survivors' accounts, Kuribayashi's letters home, Joe Rosenthal's photograph, and tunnels still on the island (now Iwo To), where remains are still being recovered.
Still debated
How many airmen the island actually saved, with claims of over 20,000 crewmen in emergency landings, is disputed and weighed against the battle's heavy cost.
Connections (5)
▸Battle of Iwo Jima was followed by Battle of OkinawaWell documented
The connection
Iwo Jima ended in late March 1945, and the invasion of Okinawa began April 1. Both were stepping stones toward Japan's home islands, and both showed Japanese defenders shifting from beach defense to deep, fortified positions meant to bleed attackers, making each island costlier than the last.
When and how
Iwo Jima, February–March 1945, and Okinawa, April–June 1945, both in Admiral Chester Nimitz's Central Pacific drive.
How we know
US campaign plans placed both as steps toward invading Japan, and Japanese defense plans show the shared strategy of attrition.
Debates and open questions
Whether either island needed to be taken at such cost has been questioned since 1945.
▸Battle of Iwo Jima was among the costliest US battles of World War IIWell documented
The connection
Iwo Jima cost about 6,800 American dead, including nearly a third of all US Marines killed in combat during the war. The flag-raising photograph became the war's most famous American image and helped sell war bonds, while the cost deepened fears about invading Japan.
When and how
Iwo Jima, Volcano Islands, February 19 – March 26, 1945: three Marine divisions against General Kuribayashi's garrison.
How we know
US Marine Corps casualty records; the Marine Corps War Memorial in Arlington, Virginia, is modeled on the photograph.
Debates and open questions
The identities of the six flag-raisers were corrected by the Marine Corps in 2016 and 2019, after decades of error.
▸Guadalcanal campaign began the island-hopping that reached Battle of Iwo JimaMostly agreed
The connection
Guadalcanal opened the Allied counterattack across the Pacific. From there forces advanced up the Solomons, then across the Central Pacific through Tarawa, the Marshalls and the Marianas, often skipping strongholds. That island-by-island drive reached Iwo Jima in February 1945, an island halfway between the Marianas and Tokyo.
When and how
Solomons 1942–43; Central Pacific 1943–45; Admiral Chester Nimitz's forces, alongside General Douglas MacArthur's parallel drive in the southwest Pacific.
How sure are we?
Campaign records trace the sequence; the link is a broad strategic one, not a direct plan running from Guadalcanal to Iwo Jima.
Debates and open questions
The 'island-hopping' strategy of bypassing bases such as Rabaul took shape in 1943, so calling Guadalcanal its start is partly a matter of framing.
▸Flamethrower cleared Japanese bunkers in the Battle of Iwo JimaWell documented
The connection
About 21,000 Japanese defenders under General Tadamichi Kuribayashi fought from tunnels, caves and concrete bunkers that shelling rarely destroyed. US Marines answered with backpack flamethrowers and flame-firing Sherman tanks, used with demolition charges. Corporal Hershel 'Woody' Williams won the Medal of Honor using a flamethrower against pillboxes. Nearly all the defenders died; about 6,800 Americans were killed.
When and how
Iwo Jima, Volcano Islands, February 19 – March 26, 1945; the 3rd, 4th and 5th Marine Divisions.
How we know
US Marine Corps after-action reports, Medal of Honor citations, unit histories, and Japanese records and survivors' accounts.
Debates and open questions
How many positions fell to flame rather than explosives is unknown. Incendiary weapons are limited by a 1980 treaty, and their ethics are still argued.
▸Native American code talkers relayed hundreds of messages in the Battle of Iwo JimaWell documented
The connection
At Iwo Jima, six Navajo code talkers of the 5th Marine Division worked around the clock during the first two days, sending and receiving over 800 messages without error. Their signal officer, Major Howard Connor, later said the Marines would never have taken the island without the Navajos.
When and how
Iwo Jima, February 19 – March 26, 1945; Navajo Marines serving in the 3rd, 4th and 5th Marine Divisions.
How we know
Connor's postwar statement, widely quoted in Marine Corps histories, and veterans' accounts; the message count comes from that testimony.
Debates and open questions
Connor's praise is often quoted, but the exact figures rest largely on his recollection rather than surviving message logs.