The Panzergrenadier Division "Großdeutschland", also commonly referred to simply as Großdeutschland or Großdeutschland Division, was an elite combat unit of the German Army (Heer) that fought on the Eastern Front in World War II. Originally formed in 1921 it was known as the Wachregiment Berlin and served as a ceremonial guard unit and by the 1939 had grown into a regiment of the combined Wehrmacht German armed forces. The regiment would later be expanded and renamed Infantry Division Großdeutschland in 1942, and after significant reorganization was renamed Panzergrenadier Division Großdeutschland in May 1943. In November 1944, while the division retained its status as a panzergrenadier division, some of its subordinate units were expanded to divisional status, and the whole group of divisions were reorganized as Panzerkorps Großdeutschland. 1939–1942 The Infantry Regiment Grossdeutschland was activated on 14 June 1939. The regiment saw action in France in 1940, and took part in the invasion of Yugoslavia in April 1941. It was attached to Panzer Group 2 in the opening phases of Barbarossa, and was nearly destroyed in the Battle of Moscow in late 1941. On the last day of February 1942, the remnants of the regiment absorbed two battalions of reinforcements that arrived from Neuruppin and the regiment was reconstituted. It later moved to Orel, and on 1 April 1942 the former Infantry Regiment Großdeutschland was reinforced and expanded into the Infanterie-Division Großdeutschland (mot.) (motorized Infantry Division Grossdeutschland) using newly arrived troops from Germany. The division was assigned to XXXXVIII Panzer Corps during the opening phases of Fall Blau, the Wehrmacht's 1942 strategic summer offensive in southern Russia. During the combined Soviet winter offensives Operation Uranus and Operation Mars in late November through mid-December, the division fought near Rzhev, where it was rendered combat ineffective. In January–February 1943, Großdeutschland and XXXXVIII Panzer Corps, along with the II SS Panzer Corps took part in the Third Battle of Kharkov. The division fought alongside the 1.SS Division Leibstandarte SS Adolf Hitler, 2. SS Division Das Reich and 3.SS Division Totenkopf during these battles. After the conquest of Kharkov, the Großdeutschland was again pulled back and refitted. On 19 May 1943, with the addition of armoured personnel carriers and Tigers the division was redesignated Panzergrenadier Division Großdeutschland (Armored Infantry Division Grossdeutschland), though in reality it now had more armoured vehicles than most full-strength panzer divisions. 1943–1945 The newly re-equipped division was subordinated to the XXXXVIII