The Allies AAA Guns of the Great War

The concept of an Anti Aircraft Artillery guns was not even in the imagination of field commanders in the early part of the Twenty Century. Aviation was a new field of battle then. A much misunderstood one also. But, as with any new human-developed field, there were countermeasure being develop almost at the same time that the first few planes took to the air. As in the case with many war-related innovations, Germany took the lead in this new area. Between 1908 and 09, Germany demonstrate it that an effective AAA system could be achieved with the available weapon systems. The first rudimentary “Balloon Guns”, as they were then referred to; were developed by either the vaunted Krupp Corporation or the Rheinmetall Group. These pieces were basically a field gun modified to fire at a higher angle mounted on a truck. At the same time, Germany began to encircle its biggest cities with field artillery pieces turned through 360 degrees. These pieces were placed on static angles mounts which enabled them to fire at a higher angle. At the time of the eruption of the Great War, there were so few airplanes available to either side that the development of AAA systems were relegated to the bottom of every nation’s military budget. On those days, weapons budgetary assignments usually went to the Army and Navy. In the case of an Army for example, those funds were use to develop advance armored vehicles, more powerful field and machine guns as well as heavy mortars mainly designed for siege operations.

In August 1914, the British Expeditionary Force (BEF) had only a handful of rudimentary AAA guns on towed mounts. The French were even less prepare with only two modified De Dion Bouton cars fitted with a high angled field gun. The main British AAA gun of the war was the 13th Pounder. The system was a combination of a 13th pounder light field gun mounted on Thornycroft J-type automobile which was one of the most strange-looking vehicles of the entire war. The J-types were fitted with stabilizers and screw jacks in order to prevent the guns’ recoil from overturning the vehicle. Usually, the British will deploy two of those systems accompanied by two other vehicles for the crew, range finding equipment and ammunition. The first of those 13th Pounders began to appear on the Western Front in the summer of 1915. Meanwhile, the French began to use their famous 75 mm field gun in the anti aircraft role, mostly because the gun’s high firing rate. The 75 mm AAA concept was a very simple one. One of such guns was mounted on top of a De Dion automobile fitted with several stabilizers for recoil absorption.

  British 13 Pounder Gun French 75 mm AAA Gun
Shell Weight 13 lb 15.8 lb
Gun Weight 2150 lb 8800 lb
Elevation +80 degrees +70 degrees
Vertical Range 13100′ 15500′
Muzzle Velocity 1700’/second 1740’/second

The French 75 mm gun was extensively use on all fronts by the Allies. In fact, when the first daylight bombings of London commenced in the summer of 1915, the British acquired some of these weapons in an effort to bolster their capital city’s air defenses.

The main problem facing AAA operators was the targeting of, although slow moving, a three dimensional object. At the beginning, the gun was fired directly at the aircraft but by the time the shell arrived at the right altitude, the target would had move on. Gunners began to mitigate this problem by mounting complex sights on all of their weapons. Unfortunately for the gunners, this only duplicated the batteries’s efforts. It was then found simple enough to fit one, centralized sight positioned in the middle of a battery of guns. Once the crew had managed the data related to the height, range and speed of an incoming object; this was passed on to individual targeting gunners who will calibrate its guns towards the target.

It is almost impossible to achieve a reliable figure of the number of downed aircraft by those rudimentary AAA system, but is fair to say the number was a very low one. However, conclusive evidence has shown that AAA-generated fire did altered German reconnaissance patters in the later stages of the war.

– Raul Colon

More information:
Air Power: The Men, Machines and Ideas that Revolutionized War; Stephen Budiansky, Penguin Group 2004
Dirty Little Secrets of World War II; James F. Dunnigan & Albert A. Nofi, HarperCollins 1996
Strange Victory: Hitler’s Conquest of France; Ernest R. May, Hill And Wang 2001
The Bomber War: The Allied Air Offensive against Nazi Germany, Robin Neillands, Overlook Press 2001
The Second World War; Edited Sir John Hammerton, Trident Press 2001

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