The BL 7.2 inch Howitzer Mk.I and subsequent marks were a series of heavy artillery pieces designed by the United Kingdom at the start of World War II. The 7.2 inch (183 mm) was not a new design, but instead a re-lined version of the 8 inch (203 mm) howitzers dating from World War I. The weapons were a stop-gap measure to meet the urgent need for heavy artillery faced by the Allies early in World War II. Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km (over 11 miles) into the air. ... Ypres, 1917, in the vicinity of the Battle of Passchendaele. ... When spelt with a capital A, Allies usually denotes the countries that fought together against the Central Powers in World War I and against the Axis Powers in World War II. Other uses In general, allies are people or groups that have joined an alliance and are working together to...