316 B-17 Flying Fortresses bombed Dresden, dropping 771 tons of bombs. The remaining 115 bombers from the stream of 431 misidentified their targets. Sixty bombed Prague, dropping 153 tons of bombs, while others bombed Brux and Pilsen. The 379th bombardment group started to bomb Dresden at 12:17, aiming at marshalling yards in the Friedrichstadt district west of the city centre, as the area was not obscured by smoke and cloud. The 303rd group arrived over Dresden two minutes after the 379th and found their view obscured by clouds, so they bombed Dresden using H2X radar. The groups that followed the 303rd (92nd, 306th, 379th, 384th and 457th) also found Dresden obscured by clouds, and they too used H2X. H2X aiming caused the groups to bomb with a wide dispersal over the Dresden area. The last group to attack Dresden was the 306th, and they finished by 12:30.