At 11:33 hours, 15 B-26's dropped 111 x 500 lb demolition bombs and 5 x 500 lb demolition bombs with 6 hour dely fuses over the primary target from an alltitude of 10600 to 9600 ft.
15 B-26's dropped 115 x 500 lb demolition bombs and 5 x 500 lb demolition bombs with 6 hours delay fuses in two target runs between 10:57 and 11:18 hours.
17 B-26's dropped 130 x 500 lb demolition bombs and 6 x 500 lb demolition bombs with 6 hours fuse delay on the primary target at 11:29 hours from 10600 to 9600 ft.
34 B-26's dropped 119 x 1.000 lb demolition bombs and 12 x 1.000 lb demolition bombs with 6 hour delay fuses on the alternate target at 12:21 hours.
The primary target, Avisio Railroad Viaduct, was obscured by a effective smoke screen.