What notable events in which Eiffel Tower was of primary importance took place during a war? Did any of #1 give a side an advantage during the said war?
Eiffel Tower
A radio transmitter located in the Eiffel Tower. This transmitter jammed German radio communications. This hindrance in German radio communications contributing to the Allied victory at the First Battle of the Marne.
Tower located on the Champ de Mars in Paris, France
Did Eiffel Tower contribute to a war victory?