BL 4.5-inch Medium Field Gun

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For the British World War I artillery piece, see QF 4.5-inch howitzer.
BL 4.5 inch Medium Gun
4.5 inch medium gun at IWM Duxford Flickr 5781171799.jpg
Type Medium gun
Place of origin  United Kingdom
Service history
Used by United Kingdom, Canada
Wars World War 2
Weight 12,879.4 lb (5,842.0 kg)
Barrel length 4.69 m (15 ft 5 in)
41 calibres
Crew 10

Shell 55 lb (25 kg) HE
Calibre 4.5 inch (114 mm)
Breech Welin breech and Asbury mechanism
Elevation 60-pr carriage: 0–42 degrees, 4.5/5.5-inch gun carriage: -5–45 degrees
Muzzle velocity 2,250 ft/s (686 m/s)
Maximum firing range 20,500 yards (18 km)
Sights calibrating and reciprocating

The BL 4.5 inch Medium Gun was a British gun used by field artillery in the Second World War. It had nothing in common with the QF 4.5 inch Howitzer or the QF 4.5 inch AA Gun.


A British 4.5 inch gun in Normandy, 1944

The BL 4.5 inch gun was designed as a replacement for the 60-pounder and was a long range medium gun designed for counter-battery fire. The gun was in use throughout the Second World War and it equipped a number of medium regiments, including half the Canadian ones.

The Mk 1 ordnance was designed to be mounted on the 60-pounder carriage. The Mk 2 was on a new carriage that was also used with the BL 5.5 inch gun that replaced the 6-inch howitzer. There were slight differences in the Mk 1 and Mk 2 equipments but maximum range was almost identical.

The Mk 1 gun was first issued in 1938 and equipped one or two regiments of the British Expeditionary Force. They also equipped at least one regiment in the North Africa campaign and some were lost in Greece. The 4.5 inch Mk 1 is sometimes mistaken for the 60-pounder. Both Mks were normally towed by the AEC Matador 4 × 4 medium artillery tractor.

Issues of the Mk 2 ordnance on the common carriage started in 1941 and served in North Africa, Italy and North West Europe. It was withdrawn from field service in 1945, relegated to training purposes and finally declared obsolete in 1959.

The US 4.5 inch gun M1 used the same shell design, Mk 1D in UK service with a 6/10 crh. This design was noted for its small amount of HE (3.9 lb (1.8 kg) in a 55 lb (25 kg) shell) but the larger fragments that resulted were suited to its counter-battery role. Apart from HE the only other type of shell was flare used to indicate targets for air attack. It had propellant in charges 1, 2 and 3. Intense rate of fire was 2 rounds per minute, Normal rate was one round, Gunfire was 2 to 3 rounds per minute.


Mark 1
New 4.5 inch ordnance on 60 pounder carriage introduced in the 1930s used by the Royal Artillery in France and North Africa in the Second World War.
Mark II
Modified ordnance on Carriage 4.5 inch and 5.5 inch in use in the Second World War from 1941 by British and Canadian artillery.

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