The first vehicle to be produced in any numbers was the tiny Panzer I, which at the time was known as the MG Panzerwagen. Delivery of 318 of these had been made by August 1935, along with 15 of the Zugfuhrerwagen, which was later to become the Panzer III. One aspect of tank design which the Germans got absolutely right from the very outset was to identify the importance of radio communications. Although initially only the command tanks were filled with radios that could both transmit and receive, the other vehicles were at last equipped with receiving radio sets, and this was a major advance upon the thinking of many of the countries which would come to oppose Germany. Throughout 1934 exercises continued with the experimental tank units and a number of other valuable lessons quickly became apparent, particularly the need for close co-operation between the air forces and the tanks on the ground. At this point the first serious tank tactics which were to bring so much success during the Second World War began to appear. It was soon obvious that the tanks needed to be employed on a relatively narrow front. A divisional front was estimated at about three kilometres, a great change from the wide fronts of the Great War. It was still obvious to the German High Command that the decisions which were being made, were on theory, rather than practice. Germany - and indeed every other nation of the time - had no practical experience to draw on, therefore a number of educated guesses were made. In January 1936 General Beck reported to the High Command, his findings being based on a study of a French organisation. He was also very critical of the slow rise in production capacity which was hampering the development of the tank force. Interestingly, the debate about which tasks tanks were suitable for, and whether specialist machines had to be developed for each task was already beginning to take shape. Beck’s report clearly stated that the three main tasks of the Panzers were supporting infantry, operating in units with other mobile weapons and, finally, combating tanks. Beck himself was unable to come to a decision about whether a single tank should he adapted for each of these purposes or whether a specialist vehicle should he designed for each purpose. Ultimately the decision was that the light tanks would be used in a scouting role and that an infantry support tank would be developed which was ultimately to come in the form of the Panzer IV. This left the Panzer III as the main battle tank. Amazingly the decision was taken that the 3.7cm gun which initially equipped the Panzer III would be sufficient for the battle conditions. The various types of German tank design were to cater for most eventualities on the battlefield. The Panzer I and II were earmarked for the reconnaissance role. The Panzer III was essentially for anti-tank operations and the Panzer IV was designed to provide close support for the infantry. Almost from the outset the limitations of the design for the Panzer I were obvious. The armament in the form of two machine guns, was inadequate for most purposes on the battlefield. In addition the very thin armour gave protection only against rifle bullets: almost any battlefield weapon could penetrate the armour. More significant was the fact that the crew was comprised of only two men.