Originally Posted By: Marco620
I think there is something like that called big bertha at Ft.Sill OK. Those cannons on rails hurled shells into England and France.
The two big German ones were Dora and Gustav. Gustav was successfully utilized in several operations including one that destroyed an ammunition bunker 30 meters under the sea and protected by 10m of concrete. Dora was used against Stalingrad.
These guns fired 80cm (31") shells that weighed 7 tons a distance of about 30 miles.
They were the largest rifled gun ever produced and the heaviest mobile artillery pieces ever built.