A connected ship profile

Hiryū

Hiryū’s surviving flight deck preserved Japan’s ability to strike. It could not replace the three carriers already out of action.

Profile · Evidence and limits

5 July 1939

Hiryū at Yokosuka after completion work. This prewar photograph shows the carrier before her 1942 operations.

Photographer unknown / Kure Maritime Museum collection · Source · Public domain (source statement)

Two different attacks

Hiryū’s first counterattack used dive bombers, accompanied by fighters. The second used torpedo-carrying attack aircraft. The Japanese organisation table records eighteen bombers in the first force, then nine of Hiryū’s attack aircraft and one from Akagi in the second. Fighter contributions also included machines from other carriers. The surviving flight deck was supporting more than its own original complement. M14

Those numbers describe particular formations. They do not establish the carrier’s normal capacity, her complete starting inventory or the number serviceable at every moment of the battle.

What the strike tables add

The first counterattack’s expenditure entry records twelve No.25 ordinary bombs and six No.25 land bombs. The second records nine Type 91 modification 3 torpedoes expended; the Akagi aircraft is noted as not releasing its weapon. Ten torpedo aircraft in a formation therefore did not mean ten torpedoes launched. M41

The tables’ enemy identifications and hit claims need a different check. Yorktown’s damage report records bombing, recovery of propulsion, then aerial-torpedo damage to the same ship. It does not support treating Hiryū’s two attacks as the disabling of two different American carriers. M18

A shrinking force

The Japanese narrative records further attack preparations with a much reduced aircraft force. Remaining, damaged, repairable and ready to launch were not interchangeable categories. A handful of usable machines could preserve a threat without restoring the original four-carrier strike organisation. M14

When American bombs struck Hiryū, the fight moved inside the ship. Fires and heat endangered machinery spaces; propulsion eventually failed. The report describes efforts to contain the damage, followed by evacuation to destroyers. The ship’s loss of aviation capability, loss of movement and final abandonment were successive events. M14

The original Japanese pages are available through the source notes. The readings used here are selected working translations, not a complete certified translation, and their report dates are not silently treated as American local dates.

Follow Hiryū Fights Back for the attacks and The People Left Behind for the evacuation’s human significance.

Follow the connections

Across the stories

Torpedoes from the air
British firing-mechanism changes against Bismarck and the Japanese aerial torpedoes recorded at Midway.
Akagi
Nagumo’s flagship, her aircraft contribution and the fires that forced command to move to another ship.
Bombs and torpedoes at Midway
The weapons recorded in American and Japanese carrier sorties, and what their expenditure can tell us.
USS Enterprise
The carrier, her mixed air groups and the practical work of sustaining attacks at Midway.
USS Hammann
Yorktown’s escort and salvage assistant, lost while helping the damaged carrier after Midway’s air attacks.
Kaga
A major part of Japan’s opening air attack, followed by the destruction of her bridge and a desperate fight against fire.
Nakajima B5N2 Kate
The three-seat Japanese carrier attack aircraft, its crew and its documented torpedo mission against Yorktown.
Sōryū
The carrier’s island strike, the rapid spread of fire and the evacuation of her surviving crew.
Tone
The Japanese cruiser whose No. 4 reconnaissance aircraft reported American ships during the critical morning at Midway.
Type 91 aerial torpedo
The modification recorded in Hiryū’s Midway attack, checked against the postwar naval technical investigation.
Aichi D3A1 Val
The Japanese dive bomber that struck Midway and carried Hiryū’s first counterattack to Yorktown.
USS Yorktown
Fighting damage, restoring capability and attempting salvage after Midway.
Mitsubishi A6M2 Zero
Japan’s carrier fighter, its armament and the competing demands of escort and fleet defence at Midway.

Appears in

Examine the sources ↓

Evidence within reach

Sources for this page

Open a note for the passage, inspection status and limits. Source records link to the available documents.

M14First Air Fleet detailed battle report

Contemporary Japanese command report · archival scan

Passage: PDF pp.18, 35–38 and 42–44: attack organisation, remaining strength, damage and evacuation

The carrier command’s reported assumptions, force organisation and the division of air attack, reconnaissance, support and supply tasks. The opening island strike, request for another attack and changing armament preparations. Hiryū’s counterattack aircraft, remaining strength and later fire emergency. Akagi, Kaga and Sōryū damage and evacuation; opening island-strike allocations.

Checked: Selected Japanese passages on PDF pp.10–11 and 14–15 visually checked for chapter 1. For chapter 4, pp.16–20 visually inspected and compared with M06’s English organisation tables; pp.21–22 inspected for context on 18 October 2026. For Midway Under Attack, PDF pp.29–33 / stamped 0031–0035 visually inspected and selected passages compared with M06; pp.23–26 sampled for context. For Search and Decision, PDF pp.32–33 / stamped 0034–0035 rechecked against M39’s chronological table. PDF pp.34–35 / stamped 0036–0037 visually inspected for The Morning Strikes; p.34 supports command transfer and Hiryū’s continued ability to attack. PDF pp.35–43 rendered and visually inspected for Hiryū Fights Back: pp.35–38 cover counterattack strength, claims and Hiryū’s bombing; pp.42–43 cover fire, propulsion failure and abandonment preparations. Intervening Akagi/Kaga passages inspected for context. PDF p.44 / stamped 0046 visually inspected for the continuation of Hiryū’s evacuation to destroyers. PDF p.18 / stamped 0020 re-rendered and visually inspected for Hiryū counterattack organisation. Ship-profile expansion: PDF pp.17, 39–42 and 44–46 rendered and visually inspected; selected damage passages compared with M06. Cruiser-profile review, 18–19 October 2026: PDF pp.32–33 / stamped 0034–0035 visually rechecked for the successive Tone No.4 reports and decisions. PDF p.45 / stamped 0047 visually rechecked on 21 October 2026 for the Isokaze profile: rescue, treatment and transfer to Hamakaze and Isokaze. The already retained scan was used; a fresh JACAR viewer request returned HTTP 403.

Limits: Working readings, not a certified full translation. The report was compiled after the battle and some tables include actual results, not just pre-battle plans. The English table’s Haruna aircraft type differs from the Japanese image; no type is assigned here. M06 transmits the same report family. Opening narrative compresses later attacks into the same paragraph. Its dates and times are not silently merged with the American chronology; message timing and flight-deck readiness require further records. Initial-contact timing differs between the narrative and M39’s chronological table; no fixed message delay is inferred. Predicted aircraft readiness is not a completed launch. Japanese counterattack target identities and claimed damage on these pages are not confirmed outcomes. Evacuation entries are not a complete personnel roll; scuttling orders and final sinking times remain distinct. Exact bomb-hit counts and the compressed Kaga/Sōryū terminal sinking passages do not settle scuttling contributions. Akagi command-transfer times differ within the report; no single minute is adopted. Sōryū evacuation: M14 PDF p.45 / stamped 0047 names Hamakaze and Isokaze (磯風); M06 renders the second as Isonami. The profile follows the original Japanese name.

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M41First Air Fleet report: Hiryū’s weapon expenditure

Contemporary Japanese command report · archival scan, part 4

Passage: JACAR C08030024100 · PDF pp.1 and 3 / stamped 0156 and 0158: Hiryū strike and expenditure tables

Recorded bomb categories, torpedo modification and expenditure in Hiryū’s two counterattacks.

Checked: Retained Japanese pages 1 and 3 re-rendered and visually inspected on 18 October 2026; selected fields only. Full 58-page research copy retained from 17 October.

Limits: Working readings, not a certified complete translation. Same report family as M14/M06. Expenditure is not magazine stock, hit count or a complete technical specification. Enemy identifications and damage claims are not accepted uncritically. Japanese report dates are not silently merged with American local dates.

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M18Yorktown’s damage report

Technical report · third-party scan extract

Passage: PDF pp.4–5 / printed pp.1–2: Yorktown bomb and aerial-torpedo damage

The sequence of damage, recovery, interrupted salvage and loss of Yorktown. Fuel precautions, flight-deck repair, boiler recovery, loss of power and abandonment.

Checked: PDF pages 4 and 17 visually inspected; other text selectively examined. PDF pp.4–5 rendered and visually rechecked on 18 October 2026 for Hiryū Fights Back. PDF p.6 / printed p.3 visually inspected for towing, salvage, the submarine attack and final loss. Supporting-ship update: PDF p.6 visually rechecked for Vireo’s tow and Hammann’s salvage assistance.

Limits: Relies on officers’ reconstructed recollections after records were lost. Cover publication date and complete plate set are absent from the retained extract. Draws on the captain’s submissions, so is not independent corroboration of M04. Its 1645 torpedo-hit time differs from M04’s approximately 1620, and its 23-degree abandonment list differs from M04’s 26 degrees. The paragraph 10 elapsed-time arithmetic is inconsistent; no exact repair duration is inferred from it. The post-Hammann underwater explosion is tentatively attributed to depth charges, whereas M44 leaves the cause unresolved. The smaller list after the later attack did not mean improved overall buoyancy.

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