the artillery bombardment targeted bunkers with 105 mm fire, which usually received 10–25 rounds. german flak 36 37 mm guns also did an effective job of eliminating machinegun nests. the german forces were also quick to bring up 88 mm artillery guns to fire directly into bunker apertures. between 2 and 6 june, the german 11th army expended nine percent of its munitions (42,595 rounds, amounting to 2,449 tons of munitions) on pre-advance shelling. the railway guns also fired a few rounds at the main fortifications and rail lines, but most missed by some distance. the closest shell landed 80 meters away from its target. soviet ammunition dumps were also targeted by these weapons, with no effect. the main fortifications, forts "stalin", "molotov", and "maxim gorky" (which lay in the path of liv corps) remained active. it was not until the afternoon of 6 june when a single 60 cm calibre mortar shell from the karl-gerät self-propelled mortar no. iii, nicknamed "thor", knocked out "maxim gorky's" second turret, damaging the weapon. this was the only success of the german super-heavy guns, which did not have an impact commensurate with their expense. the luftwaffe had a greater impact, using its ju 87s to knock out the communications systems of the fort.