At the end of 1941, Hitler himself became commander-in-chief of the army, which marked the beginning of Hitler's comprehensive intervention in the German military, and hitler's intervention became more and more detailed as the war developed, even to the tactical level. Hitler did not receive systematic military education, and it can be said that it is difficult to be competent for operational command, especially for the combat command of large corps. Hitler lacked the ability to respond to complex military situations, and because he could not make forward-looking judgments about the development of military situations, Hitler preferred passive defense, which saved him from greater military defeats, but also meant losing the possibility of victory.
The most typical example is in the German military strategic choice in 1942, when the situation was the most severe moment after the outbreak of war for Germany, Germany encountered a serious military crisis in the North African theater and the southern flank of the Eastern Front, the Soviet army launched a large-scale counter-offensive at Stalingrad, the entire German 6th Army has been encircled, in order to rescue the 6th Army, not only a strong armored reserve, but also a large number of transport aircraft troops. The same was true of the North African theater, where Rommel's Afrika Korps had been defeated by the Allies at the Battle of El Alamein and the Allies had made an unprecedented amphibious landing in North Africa, where the North African theater was in danger of being lost. In view of the importance and severe situation of the Eastern Front, saving hundreds of thousands of field troops on the Eastern Front should be placed first, but Hitler chose the North African Battlefield and the Eastern Front battlefield without giving up, the limited reserve and the air force were dispersed, and the result was that the German army suffered unprecedented defeat in two battlefields at the same time, first the 6th Army in Stalingrad was completely destroyed, and a few months later the African Army Group in North Africa was also annihilated by the Allies. The collapse of this kind of reorganization above the group army is also extremely rare in the entire military history of the German army, and Hitler, the supreme military commander, is obviously to blame, which is enough to prove that Hitler lacks strategic military capabilities.
Hitler's attack on the German military system after becoming commander-in-chief of the army was also quite serious, he broke the german army's already very mature flexible command system, that is, the superiors made as little interference as possible to the subordinates to exert their battlefield initiative, Hitler completely abandoned this tradition, issued more and more detailed orders, commanders at all levels became a cog in the machine, the German army's combat and coping ability became more and more sluggish, for the battlefield of world war II, which was more and more common, which would lead to a serious decline in the combat effectiveness of the German army.
In addition, in the appointment and dismissal of personnel in the German Army, Hitler always liked to frequently change front-line commanders, especially senior commanders above the group army level, mainly because these senior generals questioned and even opposed Hitler's military decisions, which led to the departure of those commanders who really had the ability and independent thinking, and the mediocre commanders who obeyed but had no opinions took over the operational command, and the result was that the German army's campaign and tactical command advantages were gradually lost. Frontline commanders, who are removed from their posts or other punishments for fear of failure, become more afraid to follow their own judgment and fully carry out the orders of their superiors, even if the orders are wrong. The frequent replacement of senior commanders is also more harmful to military command than good, because the lessons learned by the original commanders can no longer be used in the next battle, and the new commanders will continue to make the same mistakes, and the combat effectiveness of the German army will inevitably decline, which will lead to military defeat! Therefore, Hitler's appointment as commander-in-chief of the army was a serious blow to Germany militarily, and the military superiority of the German army began to decline, accelerating Germany's defeat!