Air Group Seven attacked Puryŏng-ŭp No. 3 on July 26, the Kojǒ No. 3 transformer yard on July 31, Choshin No. 1 on August 1, Kyosen No. 2 on August 3, and Kyosen No. 1 on September 21. A newly activated air group, Air Task Group Two (ATG-2), aboard USS "Essex", also attacked Kyosen No. 2 on August 3, then struck Choshin No. 1 and Kyosen No. 1 on August 5. In the fifteen attacks by the Navy, no carrier aircraft were lost. Further B-29 sorties were directed against Choshin No.1, sixteen on the night of August 29, and fifty on the night of September 1.