The term 'Christmas Truce' refers not to a single event but rather to a number of spontaneous expressions of comradeship between the front line soldiers of both sides in December 1914.

Such fraternisation was officially frowned upon, and as the casualty lists lengthened and feelings became increasingly bitter it was not repeated in subsequent wartime Christmases.

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Source:
Christmas Truce: The Western Front December 1914 by Malcolm Brown and Shirley Seaton (pub. Macmillan, London, 1994)  ISBN 0-333-62078-X