When armored divisions were first being organized in various armies, there was a natural tendency to maximize their tank strength, but as they gained combat experience, all the major mechanized powers reduced the proportion of tanks in their armored units. The British started with two armoured brigades and a support group, changed to one armoured and one motorized infantry brigade, and included an infantry battalion in the armoured brigade also. The Americans also roughly halved their tank strength, from six to three battalions. The Soviets supplemented their tank corps with mechanized corps which had about the same number of tanks but over twice the infantry. In the German case, the organizational change came after the 1940 campaign, when Hitler ordered the number of panzer divisions to be doubled. Those divisions (1-5 and 10) which had two panzer regiments lost one, and new divisions thereafter had only one panzer regiment. In part this reflected their inability to produce sufficient tanks at that point in time, but the same process occurred in the Allied armies which had no such problem. One way or another, they all arrived at around 200 medium tanks as the right number. p.s. possibly the best early armored organization was the French Light Mechanized Division (DLM) which had two tank regiments, each with one light and one medium battalion, an infantry regiment of three battalions, each including a light tank company (again about 200 tanks total), and motorized artillery, engineers, reconnaissance, and support services.