The vehicle entered service in 1917, with 3,177 vehicles manufactured by the end of World War I and 3,800 vehicles produced in total. At the beginning of World War II, a total of 1,560 vehicles were in service.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.