Main battery had time to make only two volleys and then "Blucher" embraced by fire got out of arc of fire of the battery. But there other unpleasant surprises were waiting for Germans. The batteries near the Drøbak town - Kopås and Husvik with it's fire of their 57 and 152 mm guns were able to destroy the part of the anti-aircraft artillery of the cruiser and most importantly, its steering system and make additional fire on the ship...
28 cm gun shell's weight was 255 kg. It was need to use some mechanization to deliver it from powder cellar to the gun.