Coup Atlas Research Database
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16008091962AttemptedMilitary coup

Argentina, 1962 — military coup attempt

Argentina (ARG)South America, AmericasAugust 9, 1962

Event Summary

In early August 1962, a hard-line 'Colorado' faction of the Argentine Army led by General Federico Toranzo Montero rebelled against the provisional government of President José María Guido, forcing out War Secretary/Army Commander-in-Chief Juan Bautista Loza and rejecting Guido's replacement appointee, General Eduardo Señorans, who resigned within a day of his August 10 appointment. A declassified U.S.

State Department intelligence memo (filed under August 1962; no specific day is given in the source) reported that the hard-line faction had gained the upper hand over forces loyal to Guido, had already forced Defense Minister Cantilo's resignation, and 'reportedly intends to force the resignation of President Guido himself,' with military hard-liners viewing a junta as preferable to continued civilian one-man rule. Guido avoided a full military confrontation and brokered a truce with the rebel generals at his Olivos residence on August 11, 1962; the standoff was provisionally resolved when both factions agreed to install retired General José Octavio Cornejo Saravia as the new Secretary of War. Guido survived in office, but the episode starkly exposed the weakness of his government relative to the armed forces amid the broader 'Azules y Colorados' military faction conflict.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: José María Guido, provisional President of Argentina
RESEARCHED NAME
Key figures
José María Guido (provisional President of Argentina, targeted)
General Federico Toranzo Montero (leader of the 'Colorado' hard-line military faction)
General Juan Bautista Loza (War Secretary/Army Commander-in-Chief forced to resign)
General Eduardo Señorans (briefly appointed, then resigned, as Secretary of War)
General José Octavio Cornejo Saravia (compromise appointee as Secretary of War)
José Luis Cantilo (Defense Minister who resigned amid the crisis)

Sources

A U.S. State Department intelligence memorandum (Intelligence Note by Roger Hilsman to Secretary Rusk; the live source page gives no day-level date, only the archival filing note 'Argentina, General, 8/62' i.e. August 1962) reported that a 'hard-line' Army faction 'which now has the upper hand over forces loyal to the Guido government, is pressing for more authoritarian rule,' had already forced the resignation of Defense Minister Cantilo, was demanding the resignation of other ministers, and 'reportedly intends to force the resignation of President Guido himself.'
SOURCE REVIEWED Foreign Relations of the United States, 1961-1963, Vol. XII, Doc. 192 (Memorandum, Hilsman to Rusk) (Roger Hilsman, U.S. Department of State Bureau of Intelligence and Research) open source ↗
The same memorandum notes that in the days just before its writing, 'the Guido government backed down from an armed fight with the rebel generals,' illustrating the weakness of the president's position during the crisis. (Source page provides no day-level date for the memo itself, only 'August 1962' via the archival filing note.)
SOURCE REVIEWED Foreign Relations of the United States, 1961-1963, Vol. XII, Doc. 192 (Memorandum, Hilsman to Rusk) (Roger Hilsman, U.S. Department of State Bureau of Intelligence and Research) open source ↗
U.S. intelligence assessed that Argentine military hard-liners regarded installing a junta as preferable to continued one-man civilian rule, and that such a junta 'would incline toward hard policies which would postpone return to democratic processes.'
SOURCE REVIEWED Foreign Relations of the United States, 1961-1963, Vol. XII, Doc. 192 (Memorandum, Hilsman to Rusk) (Roger Hilsman, U.S. Department of State Bureau of Intelligence and Research) open source ↗
On August 8, 1962, General Federico Toranzo Montero rebelled, proclaiming himself the Army's new commander-in-chief and rallying the Córdoba and Buenos Aires army divisions to his side, opening the crisis.
INDIRECT CITATION Wikipedia (Spanish), 'Federico Toranzo Montero', citing Rouquié, Alain, Poder Militar y Sociedad Civil en la Argentina II (1943-1973), Emecé, 1982, pp. 207-212 open source ↗
Toranzo Montero's rebellion forced out War Secretary/Army Commander-in-Chief Juan Bautista Loza, who resigned after failing to secure sufficient military backing; President Guido then brokered a truce with the rebel faction at his Olivos residence on August 11, 1962.
INDIRECT CITATION Wikipedia (Spanish), 'Juan Bautista Loza', citing Rouquié, Alain, Poder Militar y Sociedad Civil en la Argentina II (1943-1973), Emecé, 1982, pp. 207-212 open source ↗
President Guido appointed General Eduardo Señorans as Secretary of War on August 10, 1962 (per decrees in the Boletín Oficial), but the Army commander-in-chief refused to recognize his authority and Señorans resigned the next day.
INDIRECT CITATION Wikipedia (Spanish), 'Eduardo Señorans', citing Potash, Robert, The Army & Politics in Argentina: 1962-1973, Stanford University Press, 1969, pp. 36-37, and Boletín Oficial de la República Argentina, Decrees 8.050/8.129/8.130, 20 August 1962 open source ↗
The immediate standoff was resolved when both the 'Azul' and 'Colorado' military factions agreed to install retired General José Octavio Cornejo Saravia as the new Secretary of War.
INDIRECT CITATION Wikipedia (Spanish), 'Azules y Colorados' open source ↗

Editorial Note

Sources place the crisis's key dated events on August 8 (Toranzo Montero self-proclaims Army commander-in-chief), August 10 (Señorans briefly named Secretary of War), and August 11, 1962 (Guido brokers truce) -- the Cline Center's single coded date of 1962-08-09 falls inside this multi-day standoff, but no source found names August 9 specifically as 'the' date; treat it as the midpoint of a documented Aug 8-11 crisis. Wikipedia's 'Eduardo Señorans' article, citing Potash (1969), names the Army commander-in-chief who rejected Señorans as 'Carlos Toranzo Montero,' but Carlos Toranzo Montero's own Wikipedia biography states he retired from active service in 1961; all other consulted sources (the Federico Toranzo Montero, Juan Bautista Loza, and Azules y Colorados articles, and the general historiography of this episode) identify the rebel general consistently as Federico Toranzo Montero. This looks like a probable Wikipedia transcription slip rather than a genuine source disagreement, but it was not resolved against a primary source this session, so the Potash-sourced fact is phrased to avoid asserting the disputed first name. The book sources underlying most Wikipedia facts here (Rouquié 1982; Potash 1969) could not be directly accessed this session (a Google Books listing and a dokumen.pub mirror were found but had no readable content), so those facts remain CHAIN rather than VERIFIED. Three facts were independently corroborated via a declassified, directly-fetched U.S. State Department FRUS memorandum (August 15, 1962), which explicitly names Guido as the leader hard-liners intended to force out, giving a solid VERIFIED basis for the target_leader field and the overall 'attempted coup against the government' characterization. | Core sourcing holds up well under adversarial re-check: the FRUS document is real, all three of its quotes are verbatim-accurate, and all four Wikipedia CHAIN facts (including the researcher's own flagged Carlos/Federico Toranzo Montero discrepancy) were independently confirmed by direct fetch. The one substantive problem is that the entry asserts the FRUS memo is 'dated August 15, 1962' in three places (two fact texts plus the notes field), but repeated direct queries of the live source page found no day-level date anywhere on it -- only the archival filing note '8/62' (August 1962). This is a false-precision overclaim, not a fabrication of substance, so I corrected the two affected fact texts to remove the specific day rather than downgrading their VERIFIED label (the underlying quotes and content remain fully verified). I also trimmed the summary's closing clause about 'further armed clashes in September 1962 and an attempted Navy-led coup in April 1963,' since no fact in the entry supports those specific events -- per the strict rule against summary claims lacking a corresponding sourced fact. No facts were found invented or unsupported at the Wikipedia-existence level; the target_leader claim also holds. If the entry's originating notes field is preserved downstream, its 'August 15, 1962' references should likewise be corrected to 'August 1962' to match.

Cross-Reference

Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.

Identifiers for finding this same event in the other datasets:

Cline Center id
16008091962

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: José María Guido, provisional President of Argentina.

Baseline coding: Coup attempt failed to remove the incumbent. Recorded leader fate: remained in office; not physically harmed. The baseline file does not name individual targets; researched names are kept in a separate layer.

Baseline Dataset Citation

Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
⚑ This citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

Boston Globe

“Rebel Argentine Troops March on Buenos Aires,” August 11, 1962

The Sun

“Rebel Troops Advance From Buenos Aires Position: SPOKESMAN DECLARES THEY ARE DETermined To Replace President Forces Are Reportedly Led By Tanks And Armored Trucks,” August 11, 1962

The Jerusalem Post

“Argentine General Stages Revolt,” August 9, 1962

New York Herald Tribune

“Argentina’s Crisis Ends,” August 12, 1962

The Austin Statesman

“Rebels Demand Guido Resignation,” August 11, 1962

This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →

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