the Fall maneuvers and revealed numerous problems: the crews had very poor vision through the narrow slits, the machine gun had a very narrow field of fire, and the crewmen had a difficult time communicating. Furthermore, they were slow, underpowered and often broke down. One of the P-1 prototypes was rebuilt to address these issues with additional vision ports in all directions, internal ammunition storage and the machine gun's field of fire increased to 60°. It was extensively tested during 1931—1932 and a few other changes were made as a result. The armor was increased from and from and a fixed machine gun was added for the driver. Two of the other prototypes were rebuilt to the same standard; all three were officially accepted by the Army on 17 October 1933. The other prototype was eventually given to the Shah of Iran. The order for seventy was placed on 19 April 1933, all being delivered by October 1934. Operational history Czechoslovakia The 1934 Fall maneuvers validated the misgivings of many in the Army. The gunner had trouble holding his weapon at speeds over and could not lay it properly at all. The driver could not use his machine gun in addition to driving the vehicle. The vehicle had trouble negotiating the terrain, and proved unsuitable for reconnaissance because, while "buttoned-up", the crew could only see the road ahead of them. The lack of a radio made coordination among vehicles in a platoon or larger-sized formation impossible. While used as a substitute for the light tanks not yet in service during 1934–1936, the Army decided to organize them in three-vehicle platoons, and assigned them to support units in the border areas. These platoons were heavily used suppressing the protests and violence instigated by Konrad Henlein's Sudeten German Party (Sudetendeutsche Partei - SdP) and the Sudetendeutsche Freikorps (paramilitary groups trained in Germany by SS-instructors) between May and October 1938. They were also used to repel Hungarian and Polish border-crossers, sometimes up to a battalion in strength. They helped to screen the infantry when they had to evacuate southern Slovakia after the First Vienna Award on 2 November 1938. Germany The Germans captured forty Tančík vz. 33s when they occupied Czechoslovakia, but there is no record of their use so they were presumably quickly scrapped or relegated to training duties. Slovakia The thirty Tančík vz. 33s formed one platoon in the Armored Battalion