| 5th Sept 1914 | After retreating from Mons, the French reserve infantry troops stumbled across the forward guard of the German army.
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| 9th Sept 1914 | The German 1st and 2nd armies were split into two forces by a tactical error of commander von Kluck.
A 50km gap opened up, and the Anglo/French forces exploited the error.
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| 11th Sept 1914 | The Germans were halted and forced to retreat back to the Aisne River.
Entrenching began on the Chemin des Dames Ridge.
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| 13th Sept 1914 | Anglo/French armies crossed the Aisne and launched an infantry assault on the German defensive positions.
BEF were ordered to entrench
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| 14th Sept 1914
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Anglo/French troops established a bridgehead north of the Aisne.
German counter-attack forced the allies back
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| 18th Sept 1914 | Allies scaled back the offensive as German defences proved too strong
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| 28th Sept 1914 | Both armies tried to encircle the other in a bid to out-flank their opposition in the “Race to the Sea”
. This established the Western Front from the Channel to the Swiss border.
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