Canon d Infanterie de 37 Modele 1916 TRP (37mm mle 1916) Towed Infantry Support Gun
The 37mm Mle 1916 came about during the fighting of World War 1 for French forces and was still in play by the time of World War 2 in 1939.
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In 1916, with World War 1 (1914-1918) in full swing, French factories began production of a new weapon designated "Canon d'Infanterie de 37 Modele 1916 TRP". Its design was centered on providing heavy-caliber fire support at the infantry level, being man-portable to an extent and relying on a 37x94Rmm (1.45") projectile. The system consisted of the gun tube itself, as well as a recoil device, and could be mounted atop a fixed tripod assembly or a two-wheeled carriage. A gun shield near the body was optional as was a conical flash suppressor at the muzzle. An APX telescopic sight was used for accurized fire at range and an inherent rapid-firing action was built into the operation of the weapon (hence the "TRP" portion of the designation: "Tir Rapide, Puteaux").
it was once believed by many that the war would be over by Christmas of 1914 but this soon proved disastrously false as the once-fluid war bogged down into a system of trenches - creating the bloodbath that was "trench warfare". Beyond artillery, one of the key battlefield weapons providing the carnage for both sides was the machine gun which had finally come into its own concerning modern warfare. Kill zones were arranged by the defenders intent on stopping any cavalry and infantry charge attempting to overtake key positions and the machine gun accounted for hundreds of thousands of deaths in the conflict which led to measures taken directly against the weapon - which was typically seated in well-protected positions from enemy fire.
The Modele 1916 TRP was developed as such a counter, its design attributed to Atelier de Puteaux. It was thought that giving infantry a potent, ranged weapon could help unseat the defenders and clear a way for the advancing infantry lines. Additionally, the weapon could be used against other fortified positions along trenches and help to clear out messes of barbed wire.