The Ordnance BL 5.5in Medium Gun is a British artillery piece of 140mm calibre, meant to outgun and outrange lighter types of artillery. It was used in a similar role to Soviet 152mm guns in the Eastern Front. It also equipped the Federal Army's heavy artillery regiments late into the Civil War, becoming widespread at the end of said conflict. It is the most common type of medium artillery, just above the Soviet M-10