A barrage balloon is a type of airborne barrage, a large uncrewed tethered balloon used to defend ground targets against aircraft attack, by raising aloft steel cables which pose a severe risk of collision with hostile aircraft, making the attacker's approach difficult and hazardous. Early barrage balloons were often spherical. The kite balloon, having a shape and cable bridling that stabilizes the balloon and reduces drag, could be operated at higher wind speeds than a spherical balloon. Some examples carried small explosive charges that would be pulled up against the aircraft to ensure its destruction. Barrage balloons are not practical at higher altitudes due in large part to the cable's weight.
France, Germany, Italy, and the United Kingdom used barrage balloons in the First World War. While the French and German forces developed kite balloons, early British barrage balloons were spherical. [1]
Sometimes, especially around London, several balloons were used to lift a "barrage net" length: a steel cable was strung between the balloons, and more cables hung from it. These nets could be raised to an altitude comparable to the operational ceiling (15,000 feet or 4,600 metres) of the bombers of the time. By 1918 the barrage balloon defences around London stretched for 50 miles (80 km), and captured German pilots expressed great fear of them. [2]
In 1938, the British Balloon Command was established to protect cities and key targets such as industrial areas, ports, and harbors. Balloons were intended to defend against dive bombers flying at heights up to 5,000 feet (1,500 m), forcing them to fly higher and into the range of concentrated anti-aircraft fire: anti-aircraft guns could not traverse fast enough to attack aircraft flying at low altitude and high speed. By the middle of 1940, there were 1,400 balloons, a third over the London area.
While dive-bombing was a devastatingly effective tactic against undefended targets, such as Guernica and Rotterdam, dive-bombers were very vulnerable to attack by fighter aircraft when pulling up after having completed a bombing dive. Due to the effectiveness of the Royal Air Force fighters' tactic of waiting for a dive bomber to complete its dive and then pouncing when it was pulling up - a moment when it was slow and vulnerable - the use of dive bombers against the UK was discontinued by Nazi Germany. Balloons proved to be of little use against the German high-level bombers with which the dive-bombers were replaced, but continued to be manufactured nonetheless until there were almost 3,000 in 1944. They proved to be effective against the V-1 flying bomb, which usually flew at 2,000 feet (600 m) or lower but had wire-cutters on its wings to counter balloons. 231 V-1s are officially claimed to have been destroyed by balloons. [3]
The British added two refinements to their balloons, "Double Parachute Link" (DPL) and "Double Parachute/Ripping" (DP/R). The former was triggered by the shock of an enemy bomber snagging the cable, causing that section of cable to be explosively released complete with parachutes at either end; the combined weight and drag bringing down the aircraft. The latter was intended to render the balloon safe if it broke free accidentally. The heavy mooring cable would separate as the balloon and fall to the ground under a parachute; at the same time a panel would be ripped away from the balloon causing it to deflate and fall independently to the ground. [4]
The 320th Barrage Balloon Battalion, a Very Low Altitude barrage balloon battalion of the United States Army, participated in the June 1944 Normandy landings, raising barrage balloons on Omaha Beach and Utah Beach. They remained stationed at Normandy until October 1944. [5] [6] [7]
In January 1945, during Royal Navy Fleet Air Arm raids on the Palembang oil refineries, the British aircrews were surprised by the massive use of barrage balloons in the Japanese defences. These were spherical and smaller than the British type. One Grumman Avenger was destroyed, and its crew killed, from striking a balloon cable. [8]
Barrage balloons were partly filled with highly pure hydrogen. [9] "The top of the balloon was filled with hydrogen, the bottom half was left empty, so when it was put up at a certain height it filled with natural air", according to Dorothy Brannan, barrage balloon volunteer in Portsmouth, England. [10]
In 1942, Canadian and American forces began joint operations to protect the sensitive locks and shipping channel at Sault Ste. Marie along their common border among the Great Lakes against possible air attack. [11] During severe storms in August and October 1942 some barrage balloons broke loose, and the trailing cables short-circuited power lines, causing some localised disruption to mining and manufacturing.[ citation needed ] In particular, metals production was disrupted. Canadian military historical records indicate that one of the more serious incidents, known as "The October Incident", caused an estimated loss of 400 tonnes of steel and 10 tonnes of ferro-alloys.
As a result, balloons were stored during the winter months and training was improved.[ citation needed ] Lessons learned from breakaway balloons led to Operation Outward, intentional release of balloons trailing conductive cables to disrupt power supplies on the occupied European mainland.
On the road to Aachen in west Germany in 1944, the British 2nd Tactical Air Force floated barrage balloons along the American First Army sector front line (a.k.a. "bomb line") to designate the location of friendly troops during the air assault preceding the advance of ground forces, which took Aachen on October 21, 1944. Conversely, during the First Army advance past Aachen to nearby Düren, barrage balloons were floated eastward to mark the location of enemy troops to be bombed. [12]
After the war, some surplus barrage balloons were used as tethered shot balloons for nuclear weapon tests throughout most of the period when nuclear weapons were tested in the atmosphere. The weapon or shot was carried to the required altitude slung underneath the barrage balloon, allowing test shots in controlled conditions at much higher altitudes than test towers. Several of the tests in the Operation Plumbbob series were lifted to altitude using barrage balloons. [13]
A bomber is a military combat aircraft that utilizes air-to-ground weaponry to drop bombs, launch torpedoes, or deploy air-launched cruise missiles. Bombs were first dropped from an aircraft during the Italo-Turkish War, with the first major deployments coming in the First World War and Second World War by all major airforces, damaging cities, towns, and rural areas. The first bomber planes in history were the Italian Caproni Ca 30 and British Bristol T.B.8, both of 1913. Some bombers were decorated with nose art or victory markings.
The V-1 flying bomb was an early cruise missile. Its official Reich Aviation Ministry (RLM) designation was Fieseler Fi 103 and its suggestive name was Höllenhund (hellhound). It was also known to the Allies as the buzz bomb or doodlebug and in Germany as Kirschkern or Maikäfer (maybug).
A military aircraft is any fixed-wing or rotary-wing aircraft that is operated by a legal or insurrectionary military of any type. Military aircraft can be either combat or non-combat:
Anti-aircraft warfare is the counter to aerial warfare and includes "all measures designed to nullify or reduce the effectiveness of hostile air action". It encompasses surface-based, subsurface (submarine-launched), and air-based weapon systems, in addition to associated sensor systems, command and control arrangements, and passive measures. It may be used to protect naval, ground, and air forces in any location. However, for most countries, the main effort has tended to be homeland defence. Missile defence is an extension of air defence, as are initiatives to adapt air defence to the task of intercepting any projectile in flight.
A dive bomber is a bomber aircraft that dives directly at its targets in order to provide greater accuracy for the bomb it drops. Diving towards the target simplifies the bomb's trajectory and allows the pilot to keep visual contact throughout the bomb run. This allows attacks on point targets and ships, which were difficult to attack with conventional level bombers, even en masse.
The Blohm & Voss BV 40 was a prototype armoured German glider initially designed in mid-1943 by Blohm & Voss to attack Allied bomber formations during World War II. The BV 40 would be towed to high altitude by single-engined fighters and then ram the bombers while in a dive, but this concept was rejected before its first flight in May 1944 in favour of using its guns. The Luftwaffe had lost interest in the BV 40's original mission the month prior; development continued as its mission changed to attacking ships with specialized bombs. Blohm & Voss discovered that the prototypes were significantly overweight, and some of the armour and one gun had to be removed to conduct flight testing. The BV 40 was cancelled in August with only 6 gliders completed out of the 21 ordered. All of the aircraft were destroyed in an air raid in October.
The Dornier Do 217 was a bomber used by the German Luftwaffe during World War II. It was a more powerful development of the Dornier Do 17, known as the Fliegender Bleistift. Designed in 1937-38 as a heavy bomber but not meant to be capable of the longer-range missions envisioned for the larger Heinkel He 177, the Do 217's design was refined during 1939 and production began in late 1940. It entered service in early 1941 and by the beginning of 1942 was available in significant numbers.
The Junkers Ju 88 is a twin-engined multirole combat aircraft designed and produced by the German aircraft manufacturer Junkers Aircraft and Motor Works. It was used extensively during the Second World War by the Luftwaffe and became one of the most versatile combat aircraft of the conflict.
The Petlyakov Pe-2 was a Soviet twin-engine dive bomber used during World War II. One of the outstanding tactical attack aircraft of the war, it also proved successful as a heavy fighter, as a night fighter and as a reconnaissance aircraft. The Pe-2 was, numerically, the most important Soviet bomber of World War II, at their peak comprising 75% of the Soviet twin-engine bomber force. The Soviets manufactured Pe-2s in greater numbers during the war than any other twin-engine combat aircraft except for the German Junkers Ju 88 and the British Vickers Wellington. Several communist air forces flew the type after the war, when it became known by the NATO reporting name Buck.
The history of aerial warfare began in ancient times, with the use of kites in China. In the third century, it progressed to balloon warfare. Airplanes were put to use for war starting in 1911, initially for reconnaissance, and then for aerial combat to shoot down the recon planes. The use of planes for strategic bombing emerged during World War II. Also during World War II, Nazi Germany developed many missile and precision-guided munition systems, including the first cruise missile, the first short-range ballistic missile, the first guided surface-to-air missiles, and the first anti-ship missiles. Ballistic missiles became of key importance during the Cold War, were armed with nuclear warheads, and were stockpiled by the superpowers – the United States and the Soviet Union – to deter each other from using them.
Operation Outward was a British campaign of the Second World War that attacked Germany and German-occupied Europe with free-flying balloons. It made use of cheap, simple balloons filled with hydrogen and carrying either a trailing steel wire to damage high voltage power lines by producing a short circuit, or incendiary devices to start fires in fields, forests and heathland. A total of 99,142 Outward balloons were launched; about half carried incendiaries and half carried trailing wires.
Balloons and kites were the first inventions used in aerial warfare and their primary role was reconnaissance. Balloons provided a reliable and stable means of elevating an observer high over the battlefield to obtain a birds-eye view of troop positions and movements. An early instrument of aerial intelligence collection, they were also useful for creating accurate battlefield maps, an important ingredient for battlefield success. Incendiary balloons also have a long history. The incendiary balloons carry hot air or something that can catch fire to destroy enemy territory. They could also hold small bombs for combat. The history of military ballooning dates back to the late 18th century, when the Montgolfier brothers, Joseph-Michel and Jacques-Étienne, first demonstrated the potential of hot-air balloons for military use. The first recorded military use of balloons was during the French Revolutionary Wars, when the French military used balloons to gather intelligence on the movements of the enemy. Balloons were also used during the American Civil War, where they were used for reconnaissance and communication. Balloons had a decline after several incidents in the interwar period.
An observation balloon is a type of balloon that is employed as an aerial platform for gathering intelligence and spotting artillery. The use of observation balloons began during the French Revolutionary Wars, reaching their zenith during World War I, and they continue in limited use today. Synonyms include espionage balloon, reconnaissance balloon, spy balloon, and surveillance balloon.
Pumpkin bombs were conventional aerial bombs developed by the Manhattan Project and used by the United States Army Air Forces against Japan during World War II. It was a close replication of the Fat Man plutonium bomb with the same ballistic and handling characteristics, but it used non-nuclear conventional high explosives. It was mainly used for testing and training purposes, which included combat missions flown with pumpkin bombs by the 509th Composite Group. The name "pumpkin bomb" was the term used in official documents from the large, fat ellipsoidal shape of the munition casing instead of the more usual cylindrical shape of other bombs, intended to enclose the Fat Man's spherical "physics package".
A kite balloon is a tethered balloon which is shaped to help make it stable in low and moderate winds and to increase its lift. It typically comprises a streamlined envelope with stabilising features and a harness or yoke connecting it to the main tether and a second harness connected to an observer's basket.
Operation Diver was the British code name for the V-1 flying bomb campaign launched by the German Luftwaffe in 1944 against London and other parts of Britain. Diver was the code name for the V-1, against which the defence consisted of anti-aircraft guns, barrage balloons and fighter aircraft.
The Fairey P.4/34 was a competitor for an order for a light bomber to serve with the Royal Air Force. Although not produced in that form, it formed the basis for the Fulmar long-range carrier-based fighter for the Fleet Air Arm.
The 320th Barrage Balloon Battalion was an African American United States Army unit that saw combat in Europe during World War II.
The Hardest Day was a Second World War air battle fought on 18 August 1940 during the Battle of Britain between the German Luftwaffe and British Royal Air Force (RAF). On that day, the Luftwaffe made an all-out effort to destroy RAF Fighter Command. The air battles that took place on that day were amongst the largest aerial engagements in history to that time. Both sides suffered heavy losses. In the air, the British shot down twice as many Luftwaffe aircraft as they lost. However, many RAF aircraft were destroyed on the ground, equalising the total losses of both sides. Further large and costly aerial battles took place after 18 August, but both sides lost more aircraft combined on this day than at any other point during the campaign, including 15 September, the Battle of Britain Day, generally considered the climax of the fighting. For this reason, Sunday 18 August 1940 became known as "the Hardest Day" in Britain.
Blue Joker was an experimental moored balloon-mounted, airborne early-warning radar project developed by the Royal Radar Establishment (RRE) starting in 1953. The idea was to position the radar high in the air in order to extend its radar horizon and allow it to see low-flying aircraft. Ground reflections were filtered out using a moving target indicator (MTI) system. Two examples were built and tested in the late 1950s, but the project was cancelled in 1960 as part of the Linesman/Mediator efforts.