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On the sign:
ICI FUT REÇU LE 24 AOÛT 1944 D’UN AVION LÉGER DE LA 2E DIVISION BLINDÉE LE MESSAGE DU GÉNÉRAL LECLERC AUX PARISIENS COMBATTANTS : "TENEZ BON, NOUS ARRIVONS" LANCÉ PAR LE CAPITAINE JEAN CALLET ET PAR LE LIEUTENANT ÉTIENNE MANTOUX MORT AU CHAMP D’HONNEUR
On August 24, the forces of General Philippe Leclerc advanced towards Paris in order to liberate it. Leclerc learned that Paris police chief Charles Luizet wanted to speak with him. Leclerc sent him a message "Hold on, we’re coming." The message was dropped from a light plane (Piper) by two pilots Callet and Mantoux. The message was dropped in this place, in front of the police headquarters.
Translation of the text on the sign: HERE WAS RECEIVED AUGUST 24, 1944 OF A LIGHT AIRCRAFT OF THE 2ND ARMORED DIVISION THE MESSAGE FROM GENERAL LECLERC TO THE FIGHTING PARISIANS: "HOLD ON, WE’RE COMING” LAUNCHED BY CAPTAIN JEAN CALLET AND BY LIEUTENANT ÉTIENNE MANTOUX DEATH ON THE FIELD OF HONOR