text: Three hits were claimed and one Tallboy hung up when the bomb aimer tried to drop it then fell off 15 seconds later, overshooting the bridge. Later analysis found that a Tallboy had landed on the bank at the south end of the bridge about  from the abutment and the shock of the explosion shifted it, making the span fall into the river. A Tallboy hit the north end of the bridge, the damage being swiftly repaired; another  to the south which was filled in and new track laid. Eventually the Germans demolished the bridge to create an obstacle to the Allied ground advance. Lancaster NG489 was hit by flak and the crew jettisoned the Grand Slam to regain control. Several other Lancasters were hit by anti-aircraft fire and four others were attacked by Me 262s, fifteen of which were seen on the flight to the target.
  Farge, 27 March
  Twenty Lancasters of 617 Squadron, 13 carrying Grand Slams, the remainder carrying Tallboys, attacked the Valentin submarine pens in clear visibility escorted by 90 Mustang Mk IIIs of 11 Group. Since October 1944, building work had been seen at Farge, a village on the Weser river,  north of Vegesack and  north-west of Bremen. The building had  of the structure above ground and  below, was  long and  wide, enclosing  of space. The walls and roof were made of reinforced concrete with arched trusses on the walls, filled with concrete. The roof was about  thick and was being reinforced to a thickness of . Farge was intended for the assembly of type XXI U-boats. The shipyard  at Vegesack and the site of the building, was code named , construction beginning early in 1943. The site was chosen because it was on the convex side of a curve in the river less prone to silting; the river bed was dredged to a depth of  to allow submarine sections in on barges and assembled U-boats out.