In general, French tanks of the 1930s were well-armoured, innovative vehicles that owed little to foreign designs. However, the light tanks lacked firepower and almost all French tanks were crippled by their one-man turrets. Even the vaunted Char B1 had a commander who was tasked with commanding the vehicle, aiming the main gun, and loading the main gun. If he were a platoon leader or company commander, he had the additional tasks of controlling his other units. Such a heavy set of tasks was overwhelming, and greatly reduced the effectiveness of the tanks. The lack of radios with the light tanks was not seen as a major drawback, since French doctrine called for slow-paced, deliberate manoeuvers in close conformance to plans: the "Methodical Battle" concept, adopted because wargaming showed it to be superior. The role of small unit leaders was to execute plans, not to take the initiative in combat. This was nearly the opposite of German doctrine, which stressed initiative and decision-making at low command levels ("Auftragstaktik"). In 1939 a belated effort was made to improve flexibility and increase the number of radios.