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The 1954 French flap:

The index page for the 1954 French flap section of this website is here.

September 10, 1954, La Villeneuve-en-Chevrie, Yvelines:

Reference number for this case: 10-Sep-54-Villeneuve-en-Chevrie. Thank you for including this reference number in any correspondence with me regarding this case.


In his 1958 book on the 1954 French wave, ufologist Aimé Michel indicated that on September 10, 1954, at 10 p.m., in Villeneuve-en-Chevrie near Mantes-la-Jolie in the Seine-et-Oise department, Mrs. Treussard, resident at 32, rue Mazarine in Paris, observed an oval and brilliant object.

Giving Aimé Michel as the source, author Roger-Luc Mary indicated in 1980 that the observation took place a few minutes before 10 p.m., that the department is now the Yvelines, and that the witness died in April 1979.


[Ref. aml1:] AIME MICHEL:

Aimé Michel indicates that on September 10, 1954, at 10 p.m., at Villeneuve-en-Chevrie close to Mantes-la-Jolie in the department of the Seine-et-Oise, Mrs. Treussard, residing 32, Mazarine street in Paris, observed an oval and shining object.


The name "Mrs. Treussard" appears in the list of witnesses that these authors thank for helping them to "discover the truth".


The two authors indicate that in Villeneuve-en-Chevrie, at 10:00 p.m. on September 10, 1954, there was an observation, according to Aimé Michel in "A propos des S.V.".

[Ref. rmy1:] ROGER-LUC MARY:

Chronology of the events that occurred in France, in Quarouble and its area, on September 10, 1954

[... other cases ...]

Third witness, a few minutes before 10 p.m.. Villeneuve-en-Chévrié [sic], Seine-et-Oise (new department of the Yvelines). The witness (who died in April 1979) observed a bright oval object.

[... other cases ...]


In a critical article of Barthel and Brucker's "skeptical" book, the authors indicate that Ms. Treussard's name is cited by them in a list of witnesses whom they thank at the end of their book, but that they do not speak of her sighting report.

[Ref. lgs1:] LOREN GROSS:

[... Other cases...]

That same Friday evening (the 10th [September 1954]) west of Paris, at 10:00 p.m., a UFO report was made at Villeneune-en-Chevrie [sic]. A brilliant oval object was spotted by a Mme. Traussier [sic]. 62.

[... Other cases...]

[Ref. lcn1:] LUC CHASTAN:

Luc Chastan indicates that in the Yvelines in La Villeneuve en Chevrie on September 10, 1954 at 10:00 p.m., there was an "Observation of an oval and shining object."

The source is given as "M.O.C. by Michel Aimé ** Arthaud 1958".

[Ref. uda1:] "UFODNA" WEBSITE:

10 September 1954 22:00

Villeneuve.Chevrie, France

An unidentified object was sighted, but with appearance and behavior that most likely would have a conventional explanation. One bright oval object was observed by one female 32-year-old witness (Traussier).

Hynek rating: NL

Vallee rating: FB1

The sources are indicated as: "Michel, Aime, Flying Saucers and the Straight-Line Mystery, S. G. Phillips, New York, 1958" and "Vallee, Jacques, Computerized Catalog (N = 3073)".

[Ref. ubk1:] "UFO-DATENBANK":

Case Nr. New case Nr. Investigator Date of observation Zip Place of observation Country of observation Hour of observation Classification Comments Identification
19540910 10.09.1954 Villeneuve Chevrie France 22.00 NL
19540910 10.09.1954 Mantes France 22.00 NL


Totally insufficient information, possible meteor.

In 1954, the place was in the Seine-et-Oise department, as of 2007 it is the Yvelines department.


(These keywords are only to help queries and are not implying anything.)

La Villeneuve-en-Chevrie, Yvelines, Treussard, Traussier, night, oval, shining, object


[----] indicates sources which I have not yet checked.

Document history:

Version: Created/Changed by: Date: Change Description:
1.0 Patrick Gross December 3, 2005 First published.
1.0 Patrick Gross June 25, 2010 Addition [lcn1].
1.1 Patrick Gross October 11, 2014 Addition [rmy1].
1.2 Patrick Gross December 8, 2016 Additions [lgs1], [ubk1].
1.3 Patrick Gross April 24, 2019 Additions [bbr1], [ldl1], Summary. Explanations changed, were "Not looked for yet."

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This page was last updated on April 24, 2019.