121 B-17's dispatched against Hanover (54) and the U-boat yards at Hamburg between 11:59 and 12:00 (71).[39][40] The night of 26/27 July 1943 nuisance raid 6 Mosquitoes attacked Hamburg.[9][41] night of 27/28 July 1943 Large raid 787 Halifaxes and Lancasters guided in by Pathfinders using H2S bombed about 2 miles east of city centre.