In this composite image a comparison has been made of The Somme canal. Commemorations of The First World War Centenary begin in 2014 and will last until 2018.*** COLOR 2014*** FRISE, FRANCE - MARCH 12:  Trees surround the Somme canal on March 12, 2014 in Frise, France. A number of events will be held this year to commemorate the centenary of the start of World War One.  (Photo by Peter Macdiarmid/Getty Images)***ARCHVE 1917***  The British Army On The Western Front, March 1917, Members of a Royal Garrison Artillery working party carrying duck-boards across the frozen Somme canal at Frise, March 1917. (Photo by Lt. J W Brooke/ IWM via Getty Images)