The Battle of Los Angeles: 1,440 Rounds Into the Sky, Two Cabinet Secretaries Who Disagreed, and the Photograph That Got Retouched.

What happened, in a paragraph.

On the night of February 24, 1942, the U.S. Pacific coast was in a state of heightened alert that was operationally close to panic. The previous evening, the Japanese submarine I-17 had surfaced off the coast at Goleta, north of Santa Barbara, and shelled the Ellwood oil installation — the first attack on the U.S. mainland by a foreign power since the War of 1812. The Naval Intelligence office on the West Coast had issued, that afternoon, an estimate that further attack was likely within the next ten hours. At approximately 1:44 am on February 25, U.S. Army radar acquired what was characterized as an unidentified target approximately 120 miles west of Los Angeles. Air-raid sirens were sounded; a city-wide blackout was ordered. From approximately 2:25 am, anti-aircraft batteries of the 37th Coast Artillery Brigade began tracking what observers reported as one or more slow-moving aerial objects above the city. At 3:16 am, the batteries opened fire. Over the next hour and twenty-five minutes, approximately 1,440 rounds of 12.8-pound anti-aircraft ammunition were fired into the sky above Los Angeles. No aircraft was hit; no debris of any aircraft was recovered. Five civilians died — three from injuries caused by falling spent shells or shell fragments, two from heart attacks attributed to the stress of the barrage and the blackout. Considerable property damage was caused to buildings struck by spent ordnance. The "all clear" was sounded at 7:21 am. Within hours, the explanation began to fracture publicly. Secretary of the Navy Frank Knox held a Washington press conference that afternoon and characterized the event as a "false alarm." Secretary of War Henry L. Stimson held a press conference of his own and stated that as many as fifteen aircraft had been involved, that "it is reasonable to conclude that, if unidentified airplanes were involved, they may have been from commercial sources, operated by enemy agents for purposes of spreading alarm, disclosing the locations of antiaircraft positions, or to test the effectiveness of the city's blackout." The two senior cabinet officers, on the same day, had given the country different accounts of the same event. The contradiction was never resolved by the wartime government. In 1949, the U.S. Air Force's then-new Office of Air Force History reviewed the contemporaneous records and concluded that the most likely trigger had been a release of weather balloons, magnified by "war nerves" into the prolonged barrage. That conclusion remained the official position. From the late 1950s onward, the case was re-examined within UFO-research literature, with particular attention to the February 26, 1942 front-page photograph in the Los Angeles Times that appeared to show searchlights converging on a solid object above the city. In 2011, Larry Harnisch, a Los Angeles Times staff member writing on the paper's blog The Daily Mirror, demonstrated that the published 1942 photograph had been heavily retouched from the original Times negative — that the object visible in the published image was, in the original, far less distinct, and that the smooth contours used in subsequent UFO-research reproductions were an artifact of the retouching rather than evidence of a clear object. That demonstration substantially reduced the photographic case for an identified solid object; it did not resolve the underlying question of what the 37th Coast Artillery actually fired at for an hour and a half on the night of February 25, 1942.

The documented record.

The strategic context

The barrage occurred eleven weeks after the Japanese attack on Pearl Harbor (December 7, 1941) and one day after the Ellwood shelling (February 23, 1942). The U.S. West Coast was operationally treated by U.S. military and civil-defense authorities as a probable theater of further Japanese attack. Internment of Japanese-Americans was beginning that month under Executive Order 9066 (February 19, 1942). Civil-defense blackout drills were being conducted in major coastal cities. The institutional baseline against which the night's events should be read is one of acute, recent, and shared alarm. Verified [1]

The radar contact

U.S. Army Air Defense radar acquired a target approximately 120 miles west of Los Angeles at approximately 1:44 am on February 25, 1942. The contact was characterized by the operators as a single track moving slowly toward the coast. The radar system in use was the SCR-270 long-range early-warning radar, the same equipment that had detected the incoming Japanese force at Pearl Harbor on December 7, 1941 (a contact that had been dismissed at the time as friendly inbound B-17s). Air-raid sirens were activated across the Los Angeles area at approximately 2:25 am. A city-wide blackout was ordered. Verified [2]

The barrage

The 37th Coast Artillery Brigade, headquartered at Fort MacArthur in San Pedro, was the principal anti-aircraft unit responsible for Los Angeles air defense. The brigade's batteries opened fire at approximately 3:16 am. The fire continued until approximately 4:14 am. Internal Army records subsequently established the total rounds expended at 1,433 to 1,440 (different sources cite slightly different figures depending on whether late-engagement rounds and adjacent battery activity are included). The rounds were principally 3-inch (12.8-pound) anti-aircraft shells, fired from M3 anti-aircraft guns and supplemented by smaller-caliber weapons. Verified [3]

The barrage was directed at what gunners and observers consistently described as a slow-moving aerial object or objects above the city. The reported altitude varied across observers, but most accounts placed the target between 8,000 and 12,000 feet. The barrage was visible across the entire Los Angeles basin and audible at distances of more than 50 miles. Searchlights from multiple installations converged on the apparent target throughout the engagement.

The casualties and damage

Five civilians died as a result of the barrage. Verified Three deaths were attributed to direct injuries caused by spent shells or shell fragments falling on or near the victims. Two were heart attacks attributed to the stress of the event and the prolonged blackout. Additional civilian and property damage included structural damage to buildings struck by falling ordnance and vehicle accidents during the blackout. The Los Angeles County Coroner's records for the night document the five fatalities with the cause-of-death attributions as described [4].

The Knox press conference

Secretary of the Navy Frank Knox held a press conference in Washington on the afternoon of February 25, 1942. Knox characterized the events of the previous night as "a false alarm." He stated that, on the basis of available information, "as far as I know the whole raid was a false alarm and was attributable to jittery nerves." Knox's statement implicitly assigned responsibility for the unnecessary firing of 1,440 rounds and the resulting deaths and damage to over-reaction by anti-aircraft personnel and civil-defense authorities. Verified [5]

The Stimson press conference

Secretary of War Henry L. Stimson held a separate press conference that same day — reportedly in direct response to the Knox statement, with which he disagreed. Stimson stated that as many as fifteen aircraft had been involved, that they had operated at speeds of 100 to 200 miles per hour and at altitudes between 9,000 and 18,000 feet, and that no information was yet available regarding their origin. He raised the possibility that they had been "commercial-type planes" operated by "enemy agents" for reconnaissance or sabotage purposes. Stimson's account was substantially more substantive than Knox's and substantively different in its implications. The two cabinet secretaries had publicly given the country irreconcilable accounts of the same event on the same day. Verified [6]

The contradiction was not formally resolved by the Roosevelt administration. The wartime media climate — characterized by self-censorship under Office of Censorship guidelines and by general reluctance to dwell on possible national-defense failures — meant that the press coverage moved on within days, with no compelled reconciliation between the two cabinet positions. The discrepancy was not the subject of a contemporaneous congressional inquiry.

The Los Angeles Times photograph

On February 26, 1942, the Los Angeles Times published a front-page photograph showing searchlights converging on what appeared to be a solid object in the sky above the city. The photograph was taken by a Times staff photographer during the barrage. It was reproduced widely in 1942 and would, decades later, become the principal visual artifact of the case in UFO-research literature. Verified in its 1942 publication; the image as published is in the Times archive [7].

The 1949 Office of Air Force History review

In 1949, the newly-established Office of Air Force History (within the recently-independent U.S. Air Force) reviewed the contemporaneous records of the engagement as part of a broader account of West Coast air-defense operations during the war. The review concluded that the most likely trigger of the radar contact and the subsequent barrage had been a meteorological balloon release, possibly combined with civilian aircraft activity, and that the prolonged firing reflected the over-reactivity of personnel operating in conditions of acute alarm. The review's specific phrase — that the event was a product of "war nerves" — would be widely cited in subsequent accounts. Verified as the published 1949 conclusion; the documentary support for the weather-balloon trigger was inferential rather than direct [8].

The UFO-research reinterpretation

From the late 1950s onward, the Battle of Los Angeles was reinterpreted within UFO-research literature as an early significant event in the modern UFO record. Donald Keyhoe's 1955 book The Flying Saucer Conspiracy mentioned the event briefly. More extensive treatment appeared in subsequent books by Frank Edwards, Jacques Vallée, and others. The reinterpretation typically rested on three elements: the durability of the engagement (1,440 rounds at no identified target), the Stimson account (which the official record did not refute), and the Times photograph (which appeared to show a solid object). Claimed

The 2011 Harnisch retouching analysis

In 2011, Larry Harnisch, a Los Angeles Times staff writer maintaining the paper's historical blog The Daily Mirror, examined the original negative of the February 26, 1942 published photograph. He demonstrated that the published image had been heavily retouched in the photo-engraving process used by 1942 newspapers — a routine practice of the era used to improve the clarity of reproduction. The retouching had artificially sharpened the contours of the apparent object, darkened its outline, and removed surrounding noise that would have indicated the diffuse character of the imaged feature. The original negative showed something far less distinct: a brighter area in the searchlight convergence that could not, on the available image quality, be characterized as a solid object of any specific shape. Verified [9]

Harnisch's demonstration substantially weakened the photographic component of the UFO-research case. It did not refute the underlying question of what had triggered or sustained the 90-minute barrage. The Stimson account, the Knox-Stimson contradiction, and the absence of any identified aircraft from any source remained on the record after 2011 as they had been before.

The candidate explanations.

Hypothesis: Weather balloon(s) and "war nerves"

The 1949 Office of Air Force History position. Argument: the radar contact was a weather-balloon release of standard meteorological character; misperceived by acute-alarm-conditioned observers and amplified by the searchlight illumination, it became the focus of an extended barrage that no further radar contact or visual identification ever resolved against. Claimed

Limits: The hypothesis accounts for the radar contact and the absence of recovered debris (a balloon would have continued out of the area or descended uneventfully). It accounts for the false-alarm framing Knox offered. It does not directly account for the Stimson account, which described multiple slow-moving aircraft at specific altitudes. The hypothesis requires Stimson's account to be substantially wrong about the same event Knox was describing — an unresolved internal contradiction within the U.S. government's own contemporaneous record.

Hypothesis: Civilian or commercial aircraft (possibly hostile-operated)

Substantially the Stimson position. Argument: one or more civilian-type aircraft were operating over Los Angeles in the early morning of February 25, possibly under hostile control, for reconnaissance, sabotage, or alarm-generation purposes. The 37th Coast Artillery fired on them; their slow speeds and substantial altitude permitted survival of the barrage; they departed afterward. Claimed

Limits: No civilian or commercial aircraft was ever identified as having been in the area. No debris was recovered. Japanese carrier-based aircraft had no operational range to reach Los Angeles from any plausible launch point in February 1942 (Japanese naval aviation operating from the home islands or from submarines did not have the range or basing for a continental-U.S. operation of this kind in this period). The "commercial planes operated by agents" reading requires an asset-and-operations capability that has no documentary support.

Hypothesis: Japanese reconnaissance (submarine-launched float plane)

A variant taking advantage of the fact that Japanese I-class submarines did carry Yokosuka E14Y "Glen" float-plane reconnaissance aircraft, and that one such submarine (I-17, of the Ellwood-shelling submarine class) was operating off the California coast. Argument: a float-plane sortie was made; it transited over Los Angeles at the relevant times; the barrage was directed at it. Claimed

Limits: Japanese naval records, declassified after the war, document no I-class submarine float-plane operations over Los Angeles or the Southern California coast in the relevant period. The first acknowledged Japanese submarine float-plane sortie over the U.S. mainland was the September 9, 1942 attack on Oregon by E14Y from I-25 — seven months later, with a single aircraft, and far from Los Angeles. A February 1942 over-LA reconnaissance sortie is not in the captured Japanese records and would have been operationally exceptional.

Hypothesis: Non-human technology

Argument: the object or objects observed were of non-terrestrial origin, and the case is one of the earliest significant U.S. UFO encounters. Claimed

Limits: The strongest single piece of visual evidence — the 1942 newspaper photograph — was substantially weakened by the 2011 Harnisch retouching demonstration. The non-human-technology reading rests primarily on the inability of the conventional alternatives to fully account for the engagement; this is the residual-mystery argument rather than direct positive evidence. The witness pool of trained Army anti-aircraft observers reporting structured slow-moving aerial targets has independent weight, but is mediated by the acute-alarm context of the engagement.

Hypothesis: Misperception cascade (no actual target)

Argument: a brief and inconsequential initial radar return triggered the sirens; once the searchlights were active and the guns were ready, the visual phenomena produced by friendly-fire smoke, shell-burst illumination, and the searchlight beams themselves became the targets the gunners were tracking. The 90-minute engagement was a self-sustaining cascade rather than a response to any object actually present. Claimed

Limits: This reading has the virtue of accounting for the absence of any identified target. It is consistent with the 1949 review's "war nerves" framing. It has the difficulty that multiple independent gun-laying observers, with the disciplined sighting practice of trained anti-aircraft personnel, reported objects with specific reported altitudes and speeds. The cascade reading requires those observations to be in substantial part artifacts of the engagement's own effects.

The unanswered questions.

The Knox-Stimson contradiction

The single most consequential unresolved feature of the case. Two senior cabinet officers of the same administration, on the same day, gave the American public materially different accounts of the same event. The wartime media climate accepted the contradiction without resolution; subsequent historical work has noted the contradiction but has not surfaced any internal Roosevelt-administration document explaining how the two accounts could be reconciled. Whether the contradiction reflects Knox's relative ignorance (he was Navy and the engagement was Army), Stimson's relative speculation (he was working from the same fragmentary reports as Knox but interpreted them differently), or an actual internal administration disagreement that was never formally adjudicated, is not resolvable from the available record.

The original 1942 Army after-action report

The 37th Coast Artillery's after-action report on the engagement was filed under wartime classification and is in the National Archives' Records of the Army Air Forces and predecessor commands. Portions have been examined by historians (notably Joseph Caro and the West Coast Air Defense history team that produced the 1949 review), but a comprehensive published reproduction of the report has not been undertaken. A fully-documented examination of the precise sequence of radar contacts, fire commands, observer reports, and ammunition expenditure has not been published in the form that modern historiographic standards would require.

The radar tape

The SCR-270 radar of 1942 did not produce a recording medium analogous to modern radar tapes. The operator's verbal report and the plotted-track records held at the air-defense plot rooms are the only contemporaneous documentation of the original radar contact. Those records survive in part in the after-action material; their precision is limited by the technological state of the equipment.

The Office of Air Force History's source material

The 1949 review's specific evidentiary basis for the weather-balloon trigger has not been comprehensively published. The review cites the conclusion; the documentary record supporting the conclusion is partially in the National Archives but has not been the subject of a modern historiographic reassessment. Whether a 1942 weather-balloon release of the inferred character is documented in the meteorological-service records of the period is, as far as we can determine, not directly established.

What the original Times negative shows

The Harnisch analysis demonstrates that the published image was retouched. The original negative, in the Times archive, shows something more diffuse than the published image. What exactly the original shows — whether even an unretouched original would in principle support an identification of any specific shape under the imaging conditions of 1942 nighttime newspaper photography — is a question that better imaging analysis might address but has not, in published form, fully addressed.

Primary material.

• U.S. Army records, 37th Coast Artillery Brigade, after-action report for the engagement of February 24–25, 1942. National Archives, Records of the Army Air Forces (RG 18) and predecessor air-defense commands.
• Office of the Secretary of the Navy. Press conference transcript, Frank Knox, February 25, 1942.
• Office of the Secretary of War. Press conference transcript, Henry L. Stimson, February 25, 1942.
• Los Angeles County Coroner's records. Death certificates for the five civilian fatalities of February 25, 1942.
• Los Angeles Times. Front-page coverage, February 25 and 26, 1942, including the searchlight-convergence photograph (subsequently shown to have been retouched). Image in Times archive.
• U.S. Air Force, Office of Air Force History. The Army Air Forces in World War II, Volume I (1948–1949), and supporting records of the 1949 retrospective review.
• Office of Censorship records, 1942. Documents the wartime self-censorship environment in which initial press coverage occurred.
• Federal Bureau of Investigation. February–March 1942 field-office reports from the Los Angeles area regarding the public response and any subsequent investigative activity.
• Harnisch, Larry. The Daily Mirror (Los Angeles Times historical blog), 2011 entry on the retouching of the February 1942 photograph, including reproduction of the original negative.

The sequence.

1. December 7, 1941 Pearl Harbor attack. SCR-270 radar at Opana Point detects incoming Japanese force; contact misidentified as friendly.
2. February 19, 1942 Executive Order 9066 signed.
3. February 23, 1942 Japanese submarine I-17 shells Ellwood oil installation near Goleta, California.
4. February 24, 1942, evening West Coast Naval Intelligence issues estimate of probable further attack within 10 hours.
5. February 25, 1942, ~1:44 am Army radar acquires unidentified target ~120 miles west of Los Angeles.
6. ~2:25 am Air-raid sirens sounded; city-wide blackout ordered.
7. 3:16 am 37th Coast Artillery batteries open fire.
8. 3:16–4:14 am Barrage continues. Approximately 1,440 rounds expended.
9. ~4:14 am onward Engagement winds down.
10. 7:21 am "All clear" sounded.
11. February 25, 1942, afternoon Secretary of the Navy Knox press conference: "false alarm."
12. February 25, 1942, later Secretary of War Stimson press conference: "as many as 15 aircraft."
13. February 26, 1942 Los Angeles Times front page publishes the searchlight-convergence photograph.
14. 1949 Office of Air Force History publishes the weather-balloon-and-war-nerves conclusion.
15. Late 1950s onward UFO-research literature reinterprets the event.
16. 2011 Larry Harnisch publishes the retouching demonstration on the Los Angeles Times historical blog.
17. 2024–2026 Case persists in popular UFO discussion; not given definitive treatment in AARO Historical Report Volume I.

Cases on this archive that connect.

The Roswell Incident (File 004) — the closest case-shape parallel: a contemporaneous-press front-page story; a subsequent official explanation (Project Mogul for Roswell, weather balloons for Los Angeles); a long-running secondary literature treating the official explanation as inadequate; a single piece of photographic or material evidence at the center of the case. The Battle of Los Angeles predates Roswell by five years and is in some respects the earlier example of the structural pattern.

The Kenneth Arnold Sighting (File 051) — the conventional date-of-origin of the modern UFO era (June 24, 1947). Battle of Los Angeles is five years earlier and sits in the prehistory of the term "flying saucer" while structurally resembling later cases.

Project Blue Book (File 047) — the formal U.S. Air Force UFO-investigation program of 1952–1969 that institutionalized the analytical approach the 1949 OAFH review prefigured. Battle of Los Angeles was not within Blue Book's scope (which began ten years after the event) but the explanatory framework of "war nerves" applied retrospectively in 1949 is continuous with Blue Book's general explanatory toolkit.

Planned: a series file on contemporaneous newspaper photography in early UFO cases, addressing the role of retouching and reproduction artifacts in case-evidence; a stand-alone Office of Air Force History file.

Full bibliography.

1. U.S. Strategic Bombing Survey (Pacific). The Effects of Strategic Bombing on Japanese Morale, 1947, and supporting documents on the early-1942 strategic context including the Ellwood shelling. National Archives.
2. U.S. Army, Western Defense Command. Operations records, December 1941–March 1942, RG 338, National Archives.
3. 37th Coast Artillery Brigade. After-action report, engagement of February 24–25, 1942. RG 18 / RG 338, National Archives.
4. Los Angeles County Coroner. Death certificates and inquest records for civilian fatalities of February 25, 1942.
5. Knox, Frank, Secretary of the Navy. Press conference of February 25, 1942. Reproduced in contemporaneous wire-service coverage; cited at length in Craven and Cate (1949).
6. Stimson, Henry L., Secretary of War. Press conference of February 25, 1942. Reproduced in contemporaneous coverage and in Stimson's published diaries (Yale University Library, Henry L. Stimson Papers).
7. Los Angeles Times. "Army Says Alarm Real," February 26, 1942 (front page), and accompanying photograph.
8. Craven, Wesley Frank, and James Lea Cate, eds. The Army Air Forces in World War II, Volume I: "Plans and Early Operations, January 1939 to August 1942." University of Chicago Press for the Office of Air Force History, 1948 (substantial 1949 work product on the West Coast engagement included).
9. Harnisch, Larry. "Battle of Los Angeles — 1942 photo retouched." The Daily Mirror (Los Angeles Times), 2011.
10. Carlisle, Rodney P. Sovereignty for Sale: The Origins and Evolution of the Panamanian and Liberian Flags of Convenience, Naval Institute Press, 1981. (Tangential but covers the West Coast strategic context of early 1942.)
11. Conn, Stetson, Rose C. Engelman, and Byron Fairchild. Guarding the United States and Its Outposts. U.S. Army in World War II series, Center of Military History, 1964. Treats the West Coast air-defense organization of the period.
12. Caro, Joseph. "The Battle of Los Angeles, 1942." Air Power History journal, varied issues. The principal modern military-history treatment.
13. Klass, Philip J. UFOs Explained. Random House, 1974. Includes a skeptical treatment of the Battle of Los Angeles, accepting substantially the 1949 OAFH framework.
14. Vallée, Jacques. Anatomy of a Phenomenon: Unidentified Objects in Space — A Scientific Appraisal. Henry Regnery, 1965. Early UFO-research reinterpretation of the case.