The 4th Panzer Army (4. Panzerarmee) (operating as Panzer Group 4 (4. Panzergruppe) from its formation on 15 February 1941 to 1 January 1942, when it was redesignated as a full army) was a German panzer formation during World War II. As a key armoured component of the Wehrmacht, the army took part in the crucial battles of the German-Soviet war of 1941–45, including Operation Barbarossa, the Battle of Moscow, the Battle of Stalingrad, the Battle of Kursk, and the 1943 Battle of Kiev. Operation Barbarossa and War of annihilation As part of the German High Command's preparations for Operation Barbarossa, Generaloberst Erich Hoepner was appointed to command the 4th Panzer Group in February 1941. It was to drive toward Leningrad as part of Army Group North under Wilhelm von Leeb. On 30 March 1941, Hitler delivered a speech to about two hundred senior Wehrmacht officers where he laid out his plans for an ideological war of annihilation (Vernichtungskrieg) against the Soviet Union. He stated that he "wanted to see the impending war against the Soviet Union conducted not according to the military principles, but as a war of extermination" against an ideological enemy, whether military or civilian. Many Wehrmacht leaders, including Hoepner, echoed the sentiment. As a commander of the 4th Panzer Group, he issued a directive to his troops: The war against Russia is an important chapter in the struggle for existence of the German nation. It is the old battle of Germanic against Slav peoples, of the defence of European culture against Muscovite-Asiatic inundation, and the repulse of Jewish-Bolshevism. The objective of this battle must be the destruction of present-day Russia and it must therefore be conducted with unprecedented severity. Every military action must be guided in planning and execution by an iron will to exterminate the enemy mercilessly and totally. In particular, no adherents of the present Russian-Bolshevik system are to be spared.