BL 15-inch howitzer

The Ordnance BL 15-inch howitzer was developed by the Coventry Ordnance Works late in 1914 in response to the success of its design of the 9.2-inch siege howitzer.

BL 15-inch howitzer
Class Vehicle
Type Towed Artillery
Manufacturer Coventry Ordnance Works
Origin United Kingdom - UK (Great Britain)
Country Name Origin Year
United Kingdom - UK (Great Britain) 1915
Country Name Operational Year Retirement Year
United Kingdom - UK (Great Britain) 1915 1918 View
ManufacturerName Production From Production To Quantity
Coventry Ordnance Works 12 View

The weapon was operated by Royal Marine Artillery detachments of the Naval Brigade, with 1 gun per battery. One gun was sent to Gallipoli but not used there. They were later transferred to the British Army

It operated successfully where it was needed to destroy deep fortifications on the Western Front, but was limited by its relatively short range compared to other modern siege howitzers. The size and weight made it difficult to move and emplace. No further development occurred after the first batch of 12, and instead Britain continued to develop and produce the 12-inch howitzer and 12-inch railway howitzer.

Type Heavy siege howitzer
Place of origin  United Kingdom
Service history
In service 1915 - 1918
Used by UK and Commonwealth
Wars World War I
Production history
Designer Coventry Ordnance Works
Designed 1914
Manufacturer Coventry Ordnance Works
Number built 12
Variants Mk I
Weight 94 tons
Shell HE 1,450 lb (657.7 kg)
Calibre 15 inches (381.0 mm)
Breech Welin interrupted screw
Recoil Hydro-spring 31 inches (790 mm) constant
Carriage siege carriage
Muzzle velocity 1,117 ft/s (340 m/s)
Maximum firing range 10,795 yd (9,871 m)

End notes