The Eiffel Tower was not excluded from the events of WWI and WWII.
In 1914, at the outbreak of WWI, a radio transmitter was situated in the tower which jammed German radio communications, seriously hindering the enemy’s advance on Paris and contributing to the Allied victory at the East Battle of the Marne from 7–12 September 1914.
The Germans, however, captured Paris during WWII. Upon their arrival in the city, the lift cables of the Eiffel Tower were cut by the French.
During the years of the war, the site remained closed to the public, and the elevators were repaired only in 1946. In 1940, the German soldiers had to climb the tower to hoist the swastika flag; the flag was so large that it was blown away just a couple of hours later and needed to be replaced with a smaller one.
The Tricolour remained lowered until 25 June 1944, until the Germans had been driven out of the capital.