20th century In the early 20th century, the introduction of howitzers that were significantly larger than the heavy siege howitzers of the day made necessary the creation of a fourth category, that of "super-heavy siege howitzers". Weapons of this category include the famous Big Bertha of the German Army and the 15-inch (381 mm) howitzer of the British Royal Marine Artillery. These large howitzers were transported mechanically rather than by teams of horses. They were transported as several loads and had to be assembled at their firing position.Romanych, Marc; Rupp, Martin (2013). 42 cm "Big Bertha" and German Siege Artillery of World War I. Illustrated by Henry Morshead. Osprey Publishing.
20th century In the early 20th century the introduction of howitzers that were significantly larger than the heavy siege howitzers of the day made necessary the creation of a fourth category that of "super-heavy siege howitzers" Weapons of this category include the famous Big Bertha of the German Army and the 15-inch (381 mm) howitzer of the British Royal Marine Artillery These large howitzers were transported mechanically rather than by teams of horses They were transported as several loads and had to be assembled at their firing positionRomanych Marc; Rupp Martin (2013) 42 cm "Big Bertha" and German Siege Artillery of World War I Illustrated by Henry Morshead Osprey Publishing