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The order was presented to the officers mess by a Lt Col H.J.Stafford in 1928 - and it is thought that the young Stafford may have received the order in his trench in 1914.
An unseen order that reveals the British High Commands alarm as the famous Xmas truce of 1914 developed has come to light after 102 years.
The order from the Brigade HQ of the County of London battalion the was rushed to the front line at 11.15pm on Christmas Eve 1914, as reports started filtering back of the fraternisation
between the opposing trenches.
The order commanded the officers in the trenches 'On no account are our men allowed to hold any communication with the Germans' and 'you must open fire' if they approached the British lines.
The festive-time ceasefire, in no-man's land near Flanders, is often cited as an inspiring symbol of peace in the midst of the otherwise bloody, violent conflict of the First World War.
The framed order is being sold by C&T Auctioneers, of Ashford in Kent, with an estimate of £1,500 on September 7.