It surprises me how little we remember the First World War in the US. It seems to me that Britain sees the war as much closer to their everyday lives.
Sandsbury did this ad linked below and made a commemorative chocolate bar in the same style it would have been packaged in 1914.
This is based on the Christmas Truce of 1914 that actually occurred. The unoffical truce had such a profound effect that in subsequent years the "leadership" of both sides planned offensives or prolonged bombardments that made a repeat impossible.
: “Those who cannot remember the past are condemned to repeat it.” -George Santayana