When on 20 September the British 1st Airborne Division had to give up the positions at the Rhine bridge in Arnhem, they withdrew to the 'Perimeter' in Oosterbeek. This was a bridgehead of several square kilometers on the north bank of the Rhine. The idea behind this was that reinforcements could be transferred across the Rhine. After a few days it turned out that the perimeter could no longer be defended. On September 25, 1944, General Urquhart was ordered to withdraw the troops across the Rhine. The operation was codenamed: Berlin.
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