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| Autocannone 20/65 Mod. 1935 | |
|---|---|
| Name | Autocannone 20/65 Mod. 1935 |
| Origin | Kingdom of Italy |
| Type | Anti-aircraft autocannon |
| Service | 1935–1950s |
| Used by | Kingdom of Italy, Italian Social Republic, German Reich |
| Designer | Ansaldo |
| Manufacturer | Oto Melara, Ansaldo, Breda |
| Production date | 1935–1943 |
| Number | ~1,200 |
| Weight | 1,250 kg (mobile mount) |
| Length | 4.2 m |
| Cartridge | 20×138mmB |
| Caliber | 20 mm |
| Action | Gas-operated |
| Rate | 250–300 rpm practical |
| Velocity | 840 m/s |
| Feed | 12- or 20-round box magazine |
| Traverse | 360° |
| Elevation | −10° to +85° |
Autocannone 20/65 Mod. 1935 The Autocannone 20/65 Mod. 1935 was an Italian 20 mm anti-aircraft autocannon introduced in 1935 and widely used during the Second Italo-Ethiopian War, Spanish Civil War, and World War II. Produced by firms such as Ansaldo, Oto Melara, and Breda, it served in mobile and static roles on trucks, hulls, and emplacements for the Regio Esercito and later forces. The weapon influenced contemporary small-calibre autocannon development and saw postwar capture and reuse by German and other units.
The Autocannone's genesis involved industrial collaboration among Ansaldo, Oto Melara, and Breda in response to doctrine influenced by lessons from the Italo-Turkish War and the Second Italo-Ethiopian War. Engineers adapted the 20×138mmB cartridge already in use by weapons like the Breda 20/65 Mod. 1935 family and sought a gas-operated, air-cooled mechanism compatible with truck mounts in the vein of innovations from Fiat automotive platforms and coastal battery practices exemplified at Taranto. Design priorities mirrored operational needs identified by the Regio Esercito High Command and reflected procurement patterns evident in the Armistice of Cassibile period. Development cycles were influenced by cross-comparisons with systems from Mauser, Vickers, and Oerlikon Contraves, prompting iterative changes to feed and recoil management before acceptance trials.
The system used the 20×138mmB cartridge, achieving muzzle velocities around 840 m/s and effective ceiling performance adequate against contemporary aircraft like Supermarine Spitfire and Junkers Ju 87 in early-war altitudes. The gas-operated action delivered a practical rate of fire of 250–300 rounds per minute, constrained by 12- or 20-round box magazines similar to feed methods on Breda Model 20/65 systems. The mount provided full 360° traverse and elevation from −10° to +85°, enabling anti-aircraft and limited anti-vehicle engagement against light armoured targets such as Panzer I and Tankette L3/33. Weight and balance permitted mounting on trucks chassis from Fiat and Lancia, on armoured cars like AB 41, and on naval launch platforms used by units fighting in the Mediterranean Sea theatre. Sighting and fire-control integration mirrored contemporaneous Italian practice using optical predictors influenced by designs tested at Taranto and logistic support models employed by the Regia Marina.
Production yielded several mount and feed variants: a towed field carriage, truck-mounted single-gun installations, twin-gun configurations, and hull-mounted versions for armoured vehicles such as the Autoblinda series. Modifications included reinforced recoil systems for naval use on smaller craft engaged in the Battle of Cape Matapan environs and simplified coastal mounts for colonial service in Libya and Eritrea. Late-war improvisations under the Italian Social Republic and German occupation saw conversions to closed shield mounts, anti-invasion fixed emplacements, and coupling with captured fire-control apparatus from Wehrmacht stocks. Some units were adapted to use drum magazines or modified feed chutes inspired by captured Oerlikon hardware.
Introduced before the Spanish Civil War's climax, the Autocannone was deployed in continental and colonial theatres where mobility and light AA capability were essential. During World War II, Regio Esercito and Regia Aeronautica units employed it for point-defence of airfields and convoys, while the Regia Marina adapted versions for anti-aircraft defence aboard smaller craft in the Mediterranean Sea campaigns. After the Armistice of Cassibile, many guns were seized by Wehrmacht units and used in anti-partisan and coastal roles in the Italian Campaign (World War II), drawing parallels with German use of captured Breda and Oerlikon guns. Its performance proved adequate against early-war aircraft but increasingly marginal against faster, higher-flying designs fielded by Royal Air Force and United States Army Air Forces units later in the conflict.
Primary operators included the Kingdom of Italy and the Italian Social Republic; captured stocks were employed by the German Reich and by various Axis-aligned formations. Colonial deployments placed examples in Libya, Eritrea, and operations connected to the Balkans Campaign. Postwar, surplus pieces occasionally surfaced in inventories of Mediterranean and Balkan forces influenced by wartime transfers, paralleling broader redistribution patterns seen with Breda and captured Oerlikon Contraves systems.
Surviving Autocannone 20/65 Mod. 1935 pieces are exhibited in military museums such as collections at institutions in Rome, Florence, and regional Museo Storico della Motorizzazione Militare repositories, and appear in private collections focusing on World War II ordnance. Restored mounts are sometimes displayed alongside armoured cars like the AB 41 and artillery exhibits referencing engagements at Taranto and the Battle of Cape Matapan. Preservation challenges include magazine scarcity and wear on recoil components, leading restorers to source parts from related Breda and captured Wehrmacht inventories or to fabricate replacements consistent with original specifications.
Category:20 mm artillery Category:Artillery of Italy Category:Weapons and ammunition introduced in 1935