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.
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.
In two target runs, 18 B-26's dropped 138 x 500 lb demolition bombs and 6 x 500 lb demolition bombs with 6 hour delay fuses between 10:45 and 11:15 hours from 10600 to 9500 ft at the primary target.
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.