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B-17 Flying Fortresses of the 390th Bomb Group, 13th Bomb Wing, 8th Air Force, unload 500-pound (227-kilogram) general purpose bombs on the Hispano-Suiza engine plant and the Compagnie d'Applications Mécaniques (CAM) ball bearing factory in Bois Colombes outside of Paris, France.

After the attack in this photo, the ball bearing production was moved to mushroom caves near Taverny at great effort and expense. Casings for the Hispano-Suiza engines had to be shipped from the Pyrenees, difficult with the wrecked transport system leading up to Operation Overlord. When Paris is liberated in August 1944, cases of finished engines are found at the Hispano-Suiza plant. There was no transportation to take them to the Luftwaffe.