This is a Selfridge's postcard showing the east side of Trafalgar Square after the end of of WW1, probably 1919. There are two temporary structures shown near the entrance to the Trafalgar Square underground station, they were a YMCA hut for servicemen and a Bank of England hut where War Bonds were sold. The YMCA hut had been erected shortly after the start of the war and the Bank of England hut sometime later in about 1917.
In early November 1918 there was an exhibition of captured German guns in the Mall, over 400 were on display along both sides of the Mall. On Wednesday 13th November crowds of revellers took several of the guns to Trafalgar Square and attempted to burn them on a bonfire which damaged the plinth of Nelson's column and the surrounding paving. I believe that the damage shown in the photograph was caused in this incident. The damage itself could still be seen for sometime into the 1950s before it was repaired.
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