M1920 400mm Heavy Howitzer

The M1920 400mm Heavy Howitzer referred to by crews as the Gigant was a coastal defense gun and howitzer used in the construction of the Aurelius Line at the end of World War I into the interwar period. These artillery pieces would eventually be used to create a railway gun, with many modifications.

History
The M1920 started development in 1914 as the First World War began, as they realized that it would have to spread to Damalias at some point they started developing a successor to the earlier M1889 275mm Coastal Gun to deal with more modern Dreadnoughts and Armored Cruisers, however by the time the it was fully developed as resources were spent on development of Newer Ships, Aircraft and later tanks.