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Moltke keep two corps from 2th and 3th army in west until first battle of Marne .
German don't lose Marne but draw because of that two corps can attack foch 9th army and force Franchet d'Espèrey 5th army to stop attacking bulow 2th army.
German will have advantageous position for race to sea could German capture entire Somme river to seacoast as front-line in western front ?