During the WWII German occupation of Paris (1940–1944), the Eiffel Tower became a symbol of resistance and a key military asset. French patriots cut the elevator cables to force Nazis to climb the stairs. In 1940 German soldiers had to climb to the top to hoist the swastika, but the flag was so large it blew away just a few hours later and was replaced by a smaller one. Later the Nazis used the tower for television and radio transmissions. The Germans hung a massive “V” (for Viktoria) on the tower which refer to Augusta Victoria of Schleswig-Holstein (1858–1921), the last German Empress and Queen of Prussia as the wife of Kaiser Wilhelm II. Had the Germans wanted to proclaim victory, they would have put a large S for Sieg. Adolph Hitler had a painting of Prussian King Frederick the Great by Anton Graff in his Berlin underground bunker. However Hitler despised the monarchy believing they caused the defeat of Germany in World War One.
Parisians interpreted it to mean “Victoire” (Victory). The Allied V-for-Victory cliché became so popular as a morale raiser that the enemy had to adopt to it. The propaganda officers just changed Sieg to Viktoria. The Nazis chose to believe that the use of V’s by civilians was a sign of support for Germany.
In ancient Roman religion, Victoria was the personified goddess of victory. She is the Roman equivalent of the Greek goddess Nike. Multiple temples were erected in her honor. Winged figures, very often in pairs, representing victory were common in Roman official iconography
The Nazis just used Viktoria because it had to start with V, and the V originally meant “V for victory” when Winston Churchill used it, so they probably needed something similar in order to not make it too obvious. When the Germans started their campaign, Churchill noted that they probably meant “verloren”, German for defeat.
The French resistance would often alter one letter to these type of banners and the message was transformed to Deutschland Liegt auf allen Fronten – Germans lie on every front line.
In 1944, American pilot Bill Overstreet reportedly flew his P-51 Mustang under the arches of the tower while chasing a German plane.
In August 1944, during the German retreat, Hitler ordered military governor Dietrich von Choltitz to destroy the tower and other landmarks, but the order was disobeyed. The tower survived, and the French flag was raised again on August 25, 1944.