The German Army (Heer, heːɐ̯; army) was the land forces component of the Wehrmacht, the regular Armed Forces of Nazi Germany, from 1935 until it effectively ceased to exist in 1945 and then was formally dissolved in August 1946. During World War II, a total of about 13.6 million soldiers served in the German Army. Army personnel were made up of volunteers and conscripts.
Only 17 months after Adolf Hitler announced the German rearmament program in 1935, the army reached its projected goal of 36 divisions. During the autumn of 1937, two more corps were formed. In 1938 four additional corps were formed with the inclusion of the five divisions of the Austrian Army after the Anschluss in March. During the period of its expansion under Hitler, the German Army continued to develop concepts pioneered during World War I, combining ground and air assets into combined arms forces. Coupled with operational and tactical methods such as encirclements and "battle of annihilation", the German military managed quick victories in the two initial years of World War II, a new style of warfare described as Blitzkrieg (lightning war) for its speed and destructive power.
The Oberkommando des Heeres (OKH) was Nazi Germany's Army High Command from 1936 to 1945. In theory, the Oberkommando der Wehrmacht (OKW) served as the military General Staff for the Reich's armed forces, co-ordinating the Wehrmacht (Heer, Kriegsmarine, Luftwaffe, and the Waffen-SS) operations. In practice, the OKW acted in a subordinate role to Hitler's personal military staff, translating his ideas into military plans and orders, and issuing them to the three services. However, as World War II went on, the OKW found itself exercising an increasing amount of direct command authority over military units, particularly in the west. This meant that by 1942, the authority of the Army High Command (OKH) was limited to the Eastern Front.
The Abwehr was the army intelligence organization from 1921 to 1944.