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| QF 4.5-inch howitzer | |
|---|---|
| Name | QF 4.5-inch howitzer |
| Origin | United Kingdom |
| Type | Howitzer |
| Service | 1908–1960s |
| Used by | United Kingdom; British Empire and Commonwealth forces; various other operators |
| Wars | First World War; Irish War of Independence; Irish Civil War; Interwar period; Second World War; Korean War (limited); various colonial conflicts |
| Designer | Royal Gun Factory; Ordnance Board |
| Design date | 1907–1908 |
| Manufacturer | Royal Ordnance Factories; private firms |
| Production date | 1908–1939 (major production); later limited |
| Number | several thousand |
| Weight | around 3,700 lb (in action) |
| Part length | 86.6 in (22 calibres) |
| Cartridge | Separate-loading QF 45 lb shell (later 35 lb common shell) |
| Caliber | 4.5 in (114 mm) |
| Rate | 4–6 rpm (practical) |
| Velocity | 1,470 ft/s (approx) |
| Max range | 7,300 yd (MK I); later versions ~6,650–8,700 yd depending on charge |
| Breech | Single-motion interrupted screw |
| Recoil | Hydro-spring |
| Carriage | Box trail (Mk I–III), modified carriages in later models |
| Elevation | -5° to +45° (varied by mark) |
| Traverse | limited (about 4° each side) |
QF 4.5-inch howitzer
The QF 4.5-inch howitzer was a British field howitzer introduced in the early 20th century and employed extensively by British Army and Commonwealth artillery units through two world wars. Designed to provide medium-support indirect fire to infantry formations, it became a standard piece for divisional and corps artillery, notable for its blend of mobility, shell weight, and rate of fire. Successive marks and modifications kept it in service alongside newer designs until post‑war reorganization rendered it obsolete.
Development began under the auspices of the Ordnance Board and the Royal Gun Factory to replace older 5-inch and 7.5 cm pieces in the Territorial Force and regular divisions. Influenced by lessons from the Boer War and continental developments observed in the Imperial German Army, designers prioritized a shell heavier than the 18‑pounder field gun round but lighter and more mobile than siege artillery used by the Royal Garrison Artillery. The "quick-firing" breech mechanism, derived from contemporary QF designs used by the Royal Navy and field artillery, allowed higher rates of fire using separate-loading ammunition with a brass cartridge case. Early marks featured a short 22‑calibre barrel, hydro-spring recoil, and a box trail carriage adopted from practice in Second Boer War theater requirements. Ordnance evolution through the First World War and interwar period saw incremental changes in carriage strength, recoil buffers, and sighting equipment influenced by combat experience on the Western Front and in the Middle Eastern theatre.
Typical specifications for the common wartime marks included a 4.5‑inch (114 mm) calibre barrel about 86.6 inches in length (22 calibres), a breech employing a single-motion interrupted screw, and hydro-spring recoil with approximately 5–6 inches of recoil travel depending on charge. In-action weight was roughly 3,700 pounds, permitting horse- or motor-drawn mobility when limbered. Elevation ranged to about +45° and traverse was limited by the box trail to a few degrees either side, necessitating repositioning for wider arcs. Muzzle velocity varied by charge and shell type but was typically around 1,470 ft/s; effective ranges for the principal marks lay between about 6,600 and 8,700 yards depending on charge and mounting. Crew drills and ammunition handling supported a practical sustained rate of fire around 4–6 rounds per minute.
The QF 4.5-inch howitzer entered service around 1908 and was issued to divisional artillery units during the First World War, where it served alongside the 18-pounder field gun within Royal Field Artillery brigades. It saw action in major battles such as the Battle of the Somme, Third Battle of Ypres, and on multiple fronts including the Gallipoli Campaign and the Palestine Campaign. Interwar rearmament preserved stocks for the British Expeditionary Force in 1939–1940; the weapon continued in wide use throughout the Second World War by the British Army and Commonwealth armies in Europe, North Africa, Italy, and Burma. Post‑1945 it remained in reserve and saw limited secondary service during early Cold War conflicts and colonial operations until replaced by more modern 25‑pounder and 5.5‑inch equipment.
Doctrinal employment paired the 4.5-inch howitzer with field gun batteries to provide high‑angle, medium explosive fire for counter-battery missions, wire-cutting, and close support of assaults. Batteries were organized at divisional level within the Royal Artillery and worked in concert with observation posts, forward observers from infantry brigades, and aerial spotting from units of the Royal Flying Corps and later the Royal Air Force. Barrage techniques refined during the First World War—creeping barrages, standing barrages, and counter‑battery preparations—made extensive use of the howitzer's shell weight and explosive effect. Its limited traverse required careful battery positioning and frequent hand-laying for rapid shifts of fire. During mobile operations in the North African campaign crews adapted towing and camouflage practices to mitigate threats from enemy reconnaissance and the Luftwaffe.
Several marks of the howitzer appeared: early Mk I and Mk II patterns for pre‑war and wartime use, later wartime production marks incorporating strengthened carriages, modified recoil systems, and improved sighting gear. Interwar and wartime modifications included conversion for pneumatic-tyred wheels for mechanized towing, modified trail designs for increased elevation in mountain or jungle theaters, and mounting adaptations on self-propelled or towed platforms in limited trials. Field refurbishments replaced worn barrels and updated fuze and cartridge handling equipment as ammunition types evolved.
Ammunition was separate-loading QF, with a projectile typically described as a 45‑pound shell in early nomenclature and later standardized to a 35‑pound "common" shell for logistics parity, filled with explosive fillers such as Lyddite and later Amatol and TNT mixtures. Fuzes included impact, time, and mechanical delay types for airburst, point-detonating, and demolition effects. Smoke, star, and illumination rounds extended tactical functionality, while specialized antipersonnel and shrapnel rounds were used in early war periods before high‑explosive dominance.
Primary user was the United Kingdom, with extensive issuance across units of the British Empire and Commonwealth including the Indian Army, Canadian Expeditionary Force, Australian Imperial Force, and New Zealand Expeditionary Force. Export and lend-lease patterns placed examples with colonial forces, volunteer units, and later with post‑war allied armies in Europe and Asia. Deployment spanned static trench warfare, desert maneuver warfare, jungle operations in Burma, and occupation duties in post‑war Europe.
Surviving examples are preserved in museums and memorials such as the Imperial War Museum, regimental museums, and open‑air collections across the United Kingdom, Canada, Australia, and New Zealand. The howitzer's role influenced subsequent British artillery design, informing development of the 5.5-inch medium gun and doctrinal shifts toward increased range, firepower, and mechanization in Royal Artillery practice. Its legacy persists in battlefield archaeology, regimental histories, and studies of artillery evolution during the two world wars.
Category:Field artillery of the United Kingdom