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In page Michel-Joseph Maunoury:

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Sixth Army marched out from Paris on the morning of 5 September.[1] Maunoury was to take up positions north-east of Meaux and was due to attack the next day along the north bank of the Marne. Instead fighting began at 13:00 on 5 September, in an area where French cavalry had encountered no Germans whilst scouting, but which had since been occupied by German IV Reserve Corps, whose commander decided to attack on his own initiative. During the night the Germans withdrew to the east, but von Kluck, commander of German First Army, shifted further forces up to face Maunoury's Army. Kluck had II, IV, III and IX Corps south of the Marne.[2]