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|length= |part_length= (including breech) |crew=7 |cartridge=HE (US & France) |caliber=240 mm (9.45 inch) |action= |rate=1 per 6 min |velocity=145 m/s (475 ft/s) (max charge) |range=603 - 2,071 m (660 – 2,265 yd) |max_range= |feed= |sights= |breech=vertical sliding block |recoil= |carriage= |elevation=75° to 45° |traverse=18° left & right |diameter= |filling=amatol or ammonal |filling_weight=40 kg (90 lb) |detonation= |yield= }} The 240 mm Trench Mortar, or Mortier de 240 mm, was a large calibre mortar of World War I. An original French design, it was developed by Batignolles Company of Paris and introduced in 1915. ==Service== The weapon was dismantled for transport, requiring four carts for the barrel, base, carriage and ammunition. In action, a heavy timber platform was constructed embedded in the ground, on which the mortar base was immovably secured. The mortar carriage sat on the base and could traverse. The mortar barrel and breech were mounted on the carriage which provided elevation. They were used in the "siege warfare" on the Western Front to destroy enemy strongpoints, bunkers and similar "hard" targets which were invulnerable to lighter mortars and field guns. The US Army handbook described it : "... the use for which it is primarily adapted is in the bombardment of strongly protected targets—dwellings, covered shelters, command posts, entrances to galleries, etc—or in the destruction of sectors of trenches, salients and the like.".〔("Handbook of the 9.45-inch trench mortar matériel" United States Ordnance Department. December 1917. page 9 )〕 Their effectiveness decreased late in the war as German policy changed to a lightly held frontline, hence decreasing available targets, and they became redundant when the war of movement resumed in mid-1918. 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「240 mm Trench Mortar」の詳細全文を読む スポンサード リンク
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