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Postcard showing a commemorative plaque at Château de Pronleroy, indicating the command post of General Mangin, commander of the 48th, 129th, 133rd, and 165th infantry divisions on June 10, 11, and 12, 1918. The text recalls that it was from here that he launched the counterattack at Mery-Courcelles, the first victorious offensive of the French armies in 1918, which halted the advance of the German armies on Compiègne. Reverse: handwritten address to Mr. Royer Bernois in Pommilly (Seine), 25c stamp, cancellation of Péronne (Oise) dated June 29, 1918, publisher E. Debeaupuis, Estrées-Saint-Denis.