On 5 April, Spaatz resorted to subterfuge. Under the guise of attacking Ploesti’s main rail yard (each oil refinery also had its own such yard), the Fifteenth made its first raid on Romanian oil. As the official history of the AAF noted with some satisfaction, “Most of the 588 tons of bombs, with more than coincidental accuracy, struck and badly damaged the Astra group of refineries.” On 15 and 26 April, the Fifteenth returned, again somehow missing the main rail yard and unfortunately damaging more Axis refineries. As a result of this “transportation” bombing, German imports of finished petroleum products fell from 186,000 tons in March to 104,000 tons in April.