On the CA2 & 3 as discussed elsewhere. Possibly useful paragraph in W Lawrynowicz's book on the Schneider & St. Chamond:
The Schneider CA II was constructed, featuring a small turret armed with a 47mm cannon. Unfortunately, the completion of the project coincided with General Nivelle's restriction of tank production in favour of artillery tractors. Thus the new model of the tank did not go into production, and the completed test model was only used for training. Another design - the Schneider CA III - had its hull lengthened in the rear, a reconstructed flat front, and a machine gun fitted in the front plate. Two small cupolas were installed on the roof for the tank's commander and driver, whose functions were now separated. 50 were ordered, but eventually even the prototype remained uncompleted.
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The only CA 2 prototpye tested in Champlieu, was refused by General Estienne for two reasons (and not stop by some other Nivelle's orders) for two reason : - The motor was the same than on CA 1 and with a turret and a 47 mm gun this tank was not enough powerfull. - Without "nose", the tank was unable to well cross the trenches. The tracks was the same than on CA1.
This model was only studied like command's tank for Groups and Batteries. At that time it was decided to used Renault FT like Command's tank for Schneider and Saint Chamond units.
The story of this only protype is unknown. The CA 2 was probably send to Marly le Roi for training, and perhaps rebuilt as training tank.
Schneider unable to found a powerfull motor, the CA 3 was stopped also by General Estienne for this reason. For instance, no photo on this tank, (even of a protype) . . .
At that time FCM programm was on, and General Estienne hoped to receive quickly this new tank. . . And then begun the french's Mark V* story . . . .
There was a furious row about the CAR3 [this is how it is referred to in the original documentation] between Loucheur and Estienne & Pétain. Loucheur considered that the heavy CAR3 tanks should take priority over the light tanks, despite continual pressure from Pétain and Estienne to prioritise the latter. Loucheur told Pétain in late October that the extra Renaults ordered by the latter in September 1917 could not be delivered, promising only that it was probable that one thousand Renaults would be available by 31 March 1918, deliveries thereafter being projected at 400 to 500 per month.[1] Pétain responded that Estienne and the Comité had advised him that the proposed Schneider CAR3 heavy tank would not be available by August 1918 and thus manufacturing should be concentrated on the Renaults.[2] Loucheur expressed surprise at the contents of Pétains letter and complained about the considerable amount of time and money that already had been spent on the development of the CAR3.[3] Why, he asked, had not Estienne and Pétain decided to cancel the CAR3 previously, conveniently ignoring the fact that Estienne had written to him the month before saying that the CAR3 project should be suspended.[4] Loucheur also cast doubts on the light tank, saying that it would not be available until the middle of the next year anyway. He ended by telling Pétain that he would refuse to carry on down this route, leading as it would to disorder.[5] Pétain responded by saying that the Comité, which had many representatives from the Ministry within it, had advised that the CAR3 should be halted and that the light tank would be more appropriate to the [current] necessities of the battle.[6] Pétain finished by pointing out to Loucheur that he had asked Pétain on 26 October to make a decision as to whether to continue with the CAR3![7]
[1] Ministre de lArmement, Service Automobile, artillerie dassaut, no. 46631 1/SA, Le ministre de lArmement et des Fabrications de Guerre à M. le général commandant les armées du Nord et du Nord-est (État-major général et 1 Bureau), 28 October 1917, AFGG V/2, annexes 1284.
[2] GAN, 1 Bureau, no. 36825, legénéral commandant en chef à M. le ministre de lArmament (Cabinet), à Paris, 29 October 1917, AFGG V/2, annexes 1291. Also see Estiennes letter to Loucheur; GQG, Artillerie dAssaut, no. 6.460, Le Général Commandant lAS à M. le Général Commandant en Chef les armées du Nord at du Nord Est Etat-Major général (1 & 2 Bureaux), 29 October 1917. SHD 16 N 2120.
[3]Ministre de lArmement, Cabinet du Ministre, no. 6792 2/M, Le ministre de lArmement et des Fabrications de Guerre à M. le général commandant en chef, 2 November 1917, SHD 16 N 2120.
[4]Estiennes primary objection was to the low-powered engine (only 76 HP for a tank larger than the St Chamond) that was proposed for the tank. GAN, Artillerie dassaut, no. 5880, Le Général Commandant lAS à Monsieur le Ministre de lArmement et des Fabrications de Guerre (Service Automobile, Paris), 20 September 1917, SHD 16 N 2120.
[5]Ministre de lArmement, Cabinet du Ministre, no. 6792 2/M, Le ministre de lArmement et des Fabrications de Guerre à M. le général commandant en chef, 2 November 1917.
[6]GQG, 1 Bureau, no. 5962, Le Général Commandant en Chef à Monsieur le Ministre de lArmement et des Fabrications de Guerre (Cabinet), Paris, 6 November 1917, SHD 16 N 2120.
[7]Ibid. Dutil pointedly refers to the CAR3 as the tank that the interior wanted to construct, long after the combatants stopped wanting it, Dutil, Les Chars, p. 86. Although the CAR3 project never amounted to more than one prototype, Estienne and Pétain continued to press the Ministry for a heavy tank.