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BL 7.2-inch howitzer : ウィキペディア英語版 | BL 7.2-inch howitzer
The BL 7.2-inch howitzer Mks I–V and Mk 6, were a series of heavy artillery pieces used by the British Army throughout World War II. ==History== In 1940 the British Army concluded that the only available heavy artillery, the World War I era BL 8-inch howitzer, had insufficient range for the conditions of WWII. As a stopgap the decision was made to re-line the existing barrels to a smaller calibre and develop a new range of ammunition to achieve the desired ranges.
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