Renault AMC 35

Medium tank (1938-40)
France - 57 built

The first French tank with a two-man turret

In 1931 French armor units were about to be massively equipped with infantry support light tanks, like the Renault R35 and Hotchkiss H35. However the specifications of the time called for a cavalry medium tank. This meant a fast tank. Renault had already experience with the D1 and D2 medium infantry support models. This led Renault to create the AMC 34 (for "Automitrailleuse de Combat"). But in 1934, the specification was altered, now requesting a better armored and faster model. Renault then redesigned its plans around the same basis to save time, creating the AMC 35. This new design incorporated, for the very first time, a new experimental APX-2 two-man turret. This was not derived from any specification, but only a new idea from Renault, after hearing many operational training reports and memorandums.

Although systematic three men crews for all French tanks of the interwar were mostly dictated by demography, this was also issued by technical limitations. A smaller, one man turret was easier to design and build. The Châtillon APX-2 model was also very costly. The first prototype, conceived by Renault and presented in March 1936 to the French Vincennes materiel commission, suspicious after the rejection of the previous Renault AMC YR, first found it unacceptable for service as it didn't fulfill all requirements of speed and protection. But political pressure, ensured by the German remilitarization of the Rhineland, plus the urgent need of the cavalry, led to its eventual acceptation.

Design of the AMC 35

The AMC 35 was based on the previous AMC 34, including the new turret (still not ready for production in 1936). It was remotorized with a shortened version of the Renault B1 engine, an 11 liter V4 petrol engine generating 180 bhp, which was devoid of two cylinders and made more compact. However, as the rear compartment was not enough, the hull was lengthened to 4.57 m (15 ft). This engine had torque but was not optimized for speed, and the designed one (31 mph/50 km/h) was never approached. Fuel consumption was high, and provision was for only 300 liters, enough for only 160 km (100 mi). This was sufficient for a defensive warfare, but cavalry medium tanks were intended to exploit gaps on the battlefield, and a short push was necessary until reinforcements and supplies came.

The new 1934 specification also called for all-over protection against antitank gunfire, but then this was based on the main 37 mm (1.46 in) model (and the famous German "door knocker"). This was attained with additional riveted 25 mm (0.98 in) armor plates on the original AMC 34 hull. The 47 mm (1.85 in) frontal glacis was judged sufficient enough against higher caliber guns of the time, but it proved vulnerable against the German Pak 40 during the campaign of Belgium. The suspension was a classical spring horizontal rubber cylinder system.

Crossing capabilities were meager, with a wading capacity of 60 cm (2 ft) and 2 m (6.6 ft) large trenches. The two-man turret was equipped with a standard, light SARF QF 25 mm (0.98 in) fortress gun, which was still largely better than the common Puteaux 47 mm (1.85 in) infantry support model. But it was then still needed for the Maginot line, and the turret was finally equipped with the Puteaux long barrel 32 caliber SA35, replaced in production by the FRC 47 mm (1.85 in). The commander was on the right side of the turret, also loading, and the gunner, aiming and firing, was on the left.

Production by AMX

In December 1936 the military division of Renault was nationalized and restructured into AMX (Atelier de Construction d'Issy-les-Moulineaux). At that time, the original AMC 34 was in completion for trials. This delayed even more the first production start for the improved AMC 35. This medium tank was a low-priority project by the time and political turmoil made it difficult to speed the entire project, despite an official order from the cavalry, which nevertheless received its prototype in November 1938. In 1937 an order came form the Belgian government, but as the production failed to materialize, political pressure prevented the Belgian cancellation of its orders by delivering batches of seven tanks for France and three for Belgium. This was aided by the fact that the Cavalry corp eventually chose the Somua S35 instead.

Problems also occurred with the new APX-2 turret, which was made at Batignolles-Châtillon, of cast iron sections, bolted and riveted together. Their diascope and drum magazines were erroneously placed, so in Belgium these were rebuilt at Ghent by the SEM (Société d\'Électricité et de Mécanique Van den Kerckhove & Carels) and ready for February 1940. Each tank costed 360,000 francs apiece, but the turrets costs even far more, preventing further orders. More delays prevented any effective delivery until mid-1939, and the first arrived in Belgium or reserve units (in France) in August 1939, on the eve of WWII. An evolved version ACG-2, equipped with a new 75 mm (2.95 in) to be used as a tank destroyer, was studied in 1939, but no production was even launched. Another vehicle was rebuilt as a smoke laying vehicle, but only a prototype was ever made.

Operational life of French and Belgian AMCs

Despite the fact that many AMC 35s had been delivered and were already available in early 1940, nothing was ready to train crews. So the first batches of tanks were put in reserve, waiting further orders. These came in the desperate days of May when, after the outbreak at Sedan, all reserve materials had to be shipped to the frontline. Several ad-hoc units were hastily formed with the 47 AMC 35s available, with untrained crews and insufficient ammunition. Normal provision was 120 rounds for the SA35 and 5250 for the coaxial Hotchkiss machine-gun. The 11e régiment de cavalerie was the first one to be equipped with twelve tanks, followed by the "CFM" or "Corps Francs Motorisés", small units of seven tanks each.

They began to train themselves quickly and found many limitations, first in rough terrain were they proved unreliable and the turret design appeared unfit for two men to operate effectively in it. Plus, their armor was insufficient for a medium tank, as the events quickly proved. Finally, they had no radio, and no coordinated maneuvers were possible. These AMCs fougth desperate delaying action on the Seine and the Loire, with the famous "cadets de Saumur" reputed cadet cavalry school, without infantry nor aviation support. The few surviving vehicles, mostly abandoned, were used by the Germans for policing duties under the official PzKpfw AMC 738 (f) registration name, and training vehicles for drivers, as AMC 738(b). One hull was discovered, restored and is now at the Saumur tank museum in France.

The Belgian AMCs, also called ACG-1, were delivered in small numbers, totaling 25, until the war broke out. Many were modified until February 1940. In September 1939 a batch of eight were stationed at Watermael-Boitsfort with the Escadron d\'Auto Blindés du Corps de Cavalerie ("armored car" was officially used instead of "tank" not to provoke the Germans). They were sent to Ghent were they were joined by other vehicles, and then were sent to the defense of Brussels, in three platoons. Later, these units and other AMCs fought desperately between the 17th and 27th of May. Two apparently experienced breakdowns, and four were destroyed by skillful concentrated fire of German Pak 37 squads. The surviving ones were captured when the Belgian capitulated on May, 28. Their fate is unknown. It is a possibility that the turrets were sent to the coastal fortifications while the turretless hulls were used for training or converted as schleppers (supply tanks).

Links

The Renault AMC 35 medium tank on Wikipedia
GBM, Histoire & Collection, about WW2 French tanks
On chars-français.net (in French)

Renault AMC 35 specifications

Dimensions (l-w-h) 5.38 x 2.12 x 2.62 m (17.65 x 6.95 x 8.6 ft)
Total weight, battle ready 19.5 short tons
Crew 3 (driver, commander, gunner)
Propulsion Somua V8 petrol, 200 hp
Speed (road/off road 40/32.2 km/h (25/20 mph)
Range (road/off road)-fuel 230/130 km (143/81 mi) -510 l
Armament 47 mm (1.85 in) SA35 gun
Reibel 7.5 mm (0.295 in) machine-gun
Armor From 25 to 47 mm (0.98-1.85 in)
Total production 57

Renault AMC-35
Renault AMC 35, 11e groupement de cavalerie, Loire region, June 1940.

Renault AMC-35
An AMC 35 from the hastily equipped CFM (Corps Francs Motorisés) which fought a delaying action between the rivers Seine and Loire in June 1940. In all, five CFMs of seven tanks each were formed, but only two were ready in time to operate effectively.

AMC-35
Belgian AMC 35 (or ACG-1), one of the 10 delivered until January 1940 (of the 25 originally ordered). It fought at Antwerpen (Antwerp).

Pzkpf AMC 358f
PzKpfw AMC 738 (b) of a training unit. It was deemed so unreliable that it is unclear if any of these were really put in action against the "maquisards" and partisans, although a unit of AMC 738 (f) has existed in Wehrmacht service.

Gallery

s35 at saumur
AMC-35 at Saumur musée des blindés, fully restored, this was one of the few tanks which fought with the Cadets of Saumur cavalry school.

AMC 35 at us
AMC 35 at Saumur, front view.

The APX-2 two-man turret, detail.
The APX-2 two-man turret, detail.

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