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The Ordnance BL 12-inch howitzer was a scaled-up version of the successful BL 9.2-inch siege howitzer. ==History== Following the success of their BL 9.2-inch howitzer, Vickers designed an almost identical version scaled up to a calibre of 12 inches, the Mk II entering service on the Western Front in August 1916.〔Hogg & Thurston 1972, Page 180.〕 Eight complete equipments are reported as arriving in August 1916 and being in action in France shortly afterwards. It was similar but unrelated to the BL 12 inch railway howitzers Mk I, III and V produced by the Elswick Ordnance Company at the same time. The Mk IV was a more powerful version with longer barrel produced from 1917. Later models were used for British home defence in World War II. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「BL 12-inch howitzer」の詳細全文を読む スポンサード リンク
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