The German 7.7cm FK 96 n.A.: Improvised Anti-Aircraft Gun

      As a weapon of war, aircraft came into their own during World War One (WW1). By the close of the war in 1918, airplanes were a far cry from their predecessors at the start in 1914. Not surprisingly, the means to combat airplanes and remove them from the skies evolved as well. Dedicated anti-aircraft guns did not come about immediately and so most of the major warring powers during WW1 devised ad-hoc apparatus to enable existing guns to point skyward. Field artillery was not designed to fire at high angle and so such guns did not have the ability to elevate the gun tube to such degrees. So, there was the need to raise the gun itself to allow for more elevation as well as provide enough clearance for the gun to recoil without hitting the ground. This particular German solution is quite elaborate compared to other, cruder apparatus. 

     The gun is the German 7.7cm FK 96 n.A. (neuer Art; meaning “new Style”) and it is mounted on a carriage which is fixed centrally on the ground. This allowed the entire contraption to be moved 360 degrees via a long pole set in the back (not fitted in this photograph) which was pushed by a portion of the crew. Elevation was set via the adjusting mechanism at the back of the carriage. This was accomplished by an artilleryman sitting in the seat above it and turning a wheel which would allow more rapid adjustment of the gun. This same man would also use the anti-aircraft gun sight to bring the cannon to bear and no doubt directed the crew members assigned to traversing the carriage. All told, the crew consisted of about eight men. Interestingly, this specific carriage design was used on other guns (as other photographic evidence shows) but it is possible that other images depict guns of the same unit (and thus locally fabricated) rather than an issued piece of equipment in use by other artillery troops. In short order, dedicated anti-aircraft guns and mounts would be constructed and used by Germany, France, and Britain prior to the cessation of hostilities in 1918.

2cm Becker M II: Anti-Aircraft Success Story

     Somewhere on the Western Front, a crew poses with a 2cm (20mm) Becker M II automatic cannon. The Becker design actually predated the opening of World War One, development having begun in 1913 based on an earlier 1.9cm (19mm) model. Thus, when the German War Ministry issued a specification in June of 1915 for an aerial weapon under 3.7cm in caliber, weighing under 154lbs., and having a ten round burst, the Becker M II was already well advanced and thus at the right place and time. Unfortunately, when the weapon was mounted on Gotha G.I heavy bombers for testing in action, the Becker did not perform well. Still, potential was seen in the design and so the Spandau Arsenal was asked to lend their expertise to the weapon and after some modifications, an initial purchase order of 120 examples of the M II was placed. The Becker had a rate of fire of 325 rounds per minute and utilized a curved, 10-round or 15-round box magazine. Empty, the M II weighed 66lbs. and had a muzzle velocity of 1,600 feet per second. In service with the Deutsche Luftstreitkräfte (German Air Force), the Becker was used on the Friedrichshafen G.III heavy bomber as well as other bombers in the Großflugzeug (“Large Aircraft”;G-Klasse) category. In addition, some of the zeppelins utilized by the Kaiserliche Marine (Imperial German Navy) were also fitted with Becker cannons. The Germans also sought to use the Becker as an air-to-ground weapon and fitted it to prototype ground attack aircraft such as the Albatros D.VI and the AGO S.1. This latter use would see the Becker adapted as an anti-tank weapon for ground troops under the designation 2cm Tankabwehrkanone Becker M II. The gun was fitted to a heavy tripod though the recoil of the M II was still more than the tripod could handle and given the muzzle velocity, despite the caliber, the M II showed up poorly against tanks. In fact, the M II had a lower muzzle velocity than the Maschinengewehr 08 (MG 08) machine-gun which was 2,953 foot per second. Disliked by the troops, the Tankabwehrkanone M II saw production halted after some 200 were built and issued. The Becker, however, had better luck with the troops as a anti-aircraft weapon. Given aircraft were built of thin metal, wood, and canvas, the Becker's round, if it hit, could inflict significant damage, especially if it struck a critical component, such as the engine or control surface. However, there was no official anti-aircraft mount for the M II and so troops had to make improvised mountings such as that seen in the photograph.

     The gunner and the two loaders all wear the Infanterie Panzer (Infantry Armor) which debuted in mid-1917 and so this at least dates the photograph to that period. The armor was proof against small arms fire from 550 yards but it was more intended to protect the wearer from shell splinters and shrapnel. It came in two sizes, small and large, weighing 22lbs. and 24lbs. respectively. The smaller plates were secured to the chest plate by web straps with felt pads underneath the edges to prevent metal-on-metal noise. The armor was not popular with troops as it made shouldering a rifle and throwing grenades difficult and dug into the armpits when crawling. Thus, the armor became trench equipment rather than issued to individuals. When a unit left a particular trench line, the armor stayed behind and was then issued to the next unit to man the trench lines. Given the mobility restrictions, the armor was usually worn by machine-gun crews in static emplacements or as we see here, an anti-aircraft crew. It is likely the photograph was posed given the gun and crewmen are completely exposed. In actual combat, it would be better concealed with some form of cover, be it earthen berms or sandbagged emplacements. The M16 helmets they wear were first issued in January 1916, the shape inspired by the sallet helmet from the 15th. century. Of all the helmets made during World War One, the M16 was the best design of them all. The shape deflected away shrapnel, covered the neck and much of the head, and used a padded liner system which made wearing the helmet more comfortable. The lugs on the sides were ventilation holes and were also used as the attachment points for an armored plate. At 6lbs., the plate was not popular and was almost always used by static gun crews and snipers. Finally, the crew have donned their M17 Lederschutzmaske (leather protection mask) gas masks for the photographer.

The Canon de 75 Modèle 1897: World's First Modern Artillery Piece

(Author's Collection)

     The French Canon de 75 Modèle 1897, better known simply as the “75”, is considered to be the first modern artillery piece and a testament to its design can be seen in its use by over a dozen nations, deployment in multiple conflicts spanning the years, and that the “75” set the pattern for artillery which came after it. The key reason for the success of the “75” was its hydro-pneumatic recoil mechanism. By using cylinders with compressed air and hydraulic oil, the recoil force of the gun barrel is taken up by the cylinders. The effect of this is that the carriage of the gun barely moves, if at all. Guns without such a recoil mechanism had to be repositioned and relayed onto target after every shot as the recoil forces acted on the gun carriage, moving it out of position. With the “75”, a high rate of fire could be achieved as the gun crew did not have to put the cannon back into position. An adequately trained “75” crew could put 15 rounds per minute down range while a highly experienced crew could double that rate.

     In this photograph, an American gun crew is training with the “75” which in U.S. nomenclature was the 75mm Gun M1897. That they are training is evidenced by their wearing the campaign hats rather than helmets and that the firing position is completely exposed which would not be the case if at the front. We see the barrel in full recoil and the advantage of the carriage not moving is clearly evident by two of the crew being right behind the gun shield. The U.S. would license build the “75” though those artillery units in World War One were mostly equipped with French built “75” guns. The design would continue in use by the U.S. Army, being modernized in the 1930s with a new carriage, improved range of motion, and improved ammunition. French built guns updated were designated as the M1897A2 and A3 models while U.S. built guns were designated M1897A4 guns. When replaced in service in 1941 by the M101 105mm howitzer, the “75” was used as an anti-tank gun on M3 GMC (Gun Motor Carriage) tank destroyers and these vehicles would see action throughout the war in all combat theaters.

Canon de 32 Modèle 1870/84 à Glissement: Seeing Action in Two World Wars

(From a stereoscope card. Author's collection)

     Somewhere near the French city of Reims, a battery of French Canon de 32 Modèle 1870/84 à Glissement railway guns fire on German positions, likely during the Second Battle of the Marne which raged from July 15, 1918 to August 6, 1918. In 1915, thirty of these railway guns were constructed by the Schneider-Creusot company using former Canon de 32C Modèle 1870/84 coastal defense guns. The 320mm (32cm) gun was capable of firing a 855lb. high-explosive shell to a maximum range of 13 miles and a skilled crew could maintain a rate of fire of one round every four minutes. The carriage was designed by Schneider-Creusot to house the guns and consisted of a rectangular steel base on two, five-axle bogies. The gun used a sliding recoil system (Glissement) in which the gun cradle slid backward to absorb some of the recoil forces before having to be pushed back into battery. For firing, the gun could be elevated from 3 degrees to a maximum of 40 degrees. However, given the gun itself had no means of traverse, special curved track had to be constructed at the firing site in order to move the entire carriage along the track to obtain traverse. The curved track provided from 2 degrees of traverse up to 15 degrees. Any further angling risked instability when firing. To stabilize the carriage, once the firing position was selected, heavy wooden beams were used to reinforce the rail bed and then steel beams underneath the carriage were lowered onto the tracks and the carriage lifted onto jacks. The steel beams utilized friction between them and the track to further reduce the recoil effects. The apparatus on the back of the carriage was the shell hoist and the ammunition was in two parts, the projectile and the powder bag. The guns entered service in 1916 and served throughout the remainder of World War One and after the conflict ended, some were put into reserve.

     When World War Two began, eight Canon de 32 Modèle 1870/84 à Glissement railway guns were taken out of reserve and assigned to the 373e Regiment Artillerie Lourde sur Voie Ferrée (ALVF; Heavy Artillery on Railroad) with four guns placed with the 7e Bataillon ALVF and four with the 8e Bataillon AVLF. Both battalions were held in reserve at Seppois-le-Haut but in short order, the 7e Bataillon AVLF deployed to Hirtzbach while the 8e Bataillon AVLF was sent to Steinsoultz. Both of these locations were in the Alsace region of north-eastern France, near the German border. Following the German invasion, these guns plus one additional example were captured and put into German service under the designation 32 cm K(E) 657(f).

The Canon de 305 Modèle 1893/1896 TAZ: France’s “Colony” Railway Guns

 

A Canon de 305 Modèle 1893/1896 TAZ sending a round downrange. (Author’s Collection)

     In 1918, the French withdrew the eight Canon de 305 Modèle 1893/1896 TAZ (Tout-Azimuth) railway guns which had been in service since 1916 in order to refit them. The main reason for this was that the 305mm guns were simply too large a caliber for the carriages and so it was decided to replace them with a smaller gun. Chosen were eight Canon de 240 de Côte Modèle 1893 coastal defense guns that had originally been installed in French forts located in Dakar, Senegal and Saigon, Vietnam. The St. Chamond company, who constructed the 305mm railway gun carriage, handled the required modifications in order to fit the 240mm guns. The work was completed and in 1918, the Canon de 240 Modèle 1893/1896 TAZ railway guns were deployed and served out the remainder of World War One.

     The guns, sometimes nicknamed the “Colonies” due to them having been taken from French colonies, fired a 357lb. high-explosive shell to a maximum range of 15 miles. The shell used a separate powder charge and a trained crew could fire one round every three minutes. The gun sat on a turntable which could traverse 360 degrees but in practice, it was never traversed more than 10 degrees from either side of the centerline of the carriage due to instability caused by the recoil. When traversed, the gun had an elevation of 15 degrees up to 35 degrees but if the gun was parallel to the carriage, maximum elevation was only 29 degrees. Any higher and the breech would strike the carriage during recoil. The carriage, once a firing position was chosen, was ground anchored in place to help absorb some of the vertical forces created by firing. In addition, outriggers and screw jacks were used to create stability in the carriage. Finally, to lessen some of the recoil forces, there was a 4 degree elevated ramp the gun cradle rode up on before returning to battery. Loading the gun was accomplished by a elevated shell trolley at the rear of the carriage.

     The photograph depicts one of the Canon de 240 Modèle 1893/1896 TAZ guns, having just fired. Each of the gun crew visible are wearing the metal canister that held the Modèle 1917 Appareil Respiratoire Spécial (ARS 17) gas mask and so this can date the photograph to at least 1918 when the gun was in service or possibly in the immediate post-WW1 years as the ARS17 continued to be issued until it was replaced with the Modèle 1920 Appareil Respiratoire Spécial. This suggests that, despite the rather exposed firing position, the gun was in action rather than firing on a range. The crew has traversed the gun 90 degrees and has only deployed four of the eight outriggers. It is possible the powder charge was lessened to reduce the chance of the recoil tipping the carriage over or the crew was simply taking their chances. As was usual, none of the men remained on the carriage when the gun was fired. The man nearest the carriage was the gunner, having been the one who pulled the lanyard which fired the cannon. The box car held the powder and ammunition for the gun as well as other supplies. Wheelbarrows and railroad ties can be seen, the latter likely used during the construction of the ground anchors.

     When World War Two started, the eight guns were still in service with the 374e Regiment Artillerie Lourde sur Voie Ferrée (ALVF; Heavy Artillery on Railroad), four guns with the 10e Bataillon ALVF and four with the 11e Bataillon AVLF. These guns were situated in the south of France and all of them fell intact into German hands following a brief period of combat against Italian forces in June 1940. As was common practice for the Germans, they were pressed into service as the 24cm Kanone (E) 558 (f) and all eight were incorporated into the Atlantikwall (Atlantic Wall) coastal defenses that ran from the continental European coast all the way up through the Scandinavian coast. Four guns were positioned in Saint-Nazaire, France while the other four were sent to Narvik, Norway in 1942 before moving to Nærbø, Norway sometime in 1944.