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That would be the Philippeville massacres of 1955, which marked a severe escalation in the Algerian War of Independence.
The massacres broke out at the initiative of Youcef Zighoud, head of the North Constantinois FLN, in order to revive a flagging movement and thwart the advances made by Jacques Soustelle, delegate general of the French government in Algeria. Its purpose, according to the testimony of Lakhdar Bentobal, former deputy of Youcef Zighoud, as recounted by Yves Courrière, was to prevent apathy among the people by digging an unbridgeable gulf of blood between Algerians and French by indiscriminate killing.
Jacques Soustelle, General Delegate of the French Government in Algeria, visited El Halia. Later, he wrote:
"The corpses still littered the streets. Terrorists arrested, dazed, remained squatting under the guard of soldiers. Aligned on the beds, in devastated apartments, the dead, slaughtered, and maimed (including a four-day-old girl) offered the spectacle of their horrible wounds. The blood had spurted everywhere, staining these humble interiors, the pictures hanging on the walls, the provincial furniture, all the poor riches of these unfortunate settlers. At the Constantine hospital, women, boys, and girls a few years old were groaning in their fever and nightmares, their fingers cut off, their throats half sliced. And the clear cheerfulness of the August sun hovering indifferently over all these horrors made them even more cruel."
The initial attack, as expected, was followed by the disproportionately violent response of the French military, settler militas, and enraged vigilantes.
Thousands of prisoners trained men aged 14 to 70 years were captured and taken to a municipal stadium in the city that was turned into a camp for questioning. Despite the efforts of Dupuch, prefect of Constantine, to prevent their deaths, prisoners were massacred with machine guns, and buried in a mass grave.
According to a French soldier present: "All machine guns and machine guns were lined up in front of the crowd of prisoners who immediately began to scream. But we opened fire; ten minutes later, it was almost finished. There were so many that we had to bulldoze them."
All in all, perhaps 130 people died in the initial attack and thousands more (variously said to be anywhere between 1,000 to 12,000) in the reprisals.
Battle_of_Philippeville (English language Wikipedia) - this article has stated quality concerns about its sources, but, asides from the seemingly subjective first paragraph, roughly reports the same facts. Unlike the French-language article it does not mention that, in 2007, then-President Nicolas Sarkozy saw fit to issue an official statement regretting the events of Phillippeville.
Upvote:9
I believe the mention is of the massacre at SΓ©tif in May 1945. This was one of the earliest events leading into the Algerian war of independence. After an anticolonial protester was killed by police, a mob arose and killed roughly a hundred pieds-noirs.
You're right about the repression that followed, but the massacre itself doesn't seem to have been planned. From what I read, it was just fed-up residents of the town who did the job.