to break down (or even simply to break off) and engine noise was excessive. Prototype 79758 was used to test several other improved configurations. To compensate three more AMR 33's were built in the Spring of 1935 for a total of 123, including all prototypes. The chassis that was used for the development of the Engin P, a project for a 37 mm gun equipped tank destroyer, is not included in this number. Description The AMR 33 was a very small vehicle, long, wide and tall. It weighed only 5.5 metric tonnes; the unloaded weight of the hull 4.5 tonnes. The eight-cylinder 84 hp 4241 cc Renault Nervasport 24 CV engine allowed for an official maximum speed of – the Renault export brochure claimed and an off-road speed of . A Cleveland differential was used; there were four forward and one reverse gears. A fuel tank of allowed for a range of 200 km. The tracks were 22 centimetres wide. It had a wading capacity of sixty centimetres; could cross a trench wide, or climb a vertical obstacle or a 50% slope. The (riveted) armour of all vertical plates was 13 mm, of all inclined plates 9 mm, of the top 6 mm and of the bottom 5 mm. There was a crew of two: the driver to the left next to the engine and the tank commander/gunner behind him in the turret which was armed with a 7.5 mm Reibel machine gun. There was also a reserve machine gun that could be optionally placed on a pedestal on top of the turret for defence against aircraft. The vehicle carried 2250 7.5 mm rounds. The original proposal had foreseen the use of a special expensive Schneider turret; the prototypes had a very high octagonal Renault turret at the very back of the hull. This proved to be too awkward and was replaced on the series vehicles by a flatter design from the army Atelier de Vincennes, the AVIS-1, which was moved about a foot to the front to improve visibility. The AVIS was produced by Renault and had, unusually for a French tank turret of the thirties, a hatch in the top for observation. The normal access to the tank was by means of large double hatch at the back of the hull. Operational history The 115 vehicles available in 1934 were first assigned to the five cavalry divisions, a