In the later stage of that campaign ("Case Red"), it again advanced on the German right flank towards the Somme river, the city of Paris and the Franco-Spanish border.

Army Group B was responsible for the northern flank of the German 1942 summer offensive towards the Volga river and the Caucasian oilfields.

After the Allied Normandy landings in June 1944, Army Group B initially commanded the northern wing of the new Western Front.

It is notable on the Western Front as the army group to oversee the German Ardennes Offensive ("Battle of the Bulge").

[1]: 22  In the initial OKH draft for the attack against France, Army Group B was assigned the Schwerpunkt role, but the intervention by senior officers (notably Erich von Manstein) from its southern neighbor, Army Group A, resulted in a shift in the German planning starting in January to February 1940.

In the second part of that campaign ("Case Red"), Army Group B again found itself on the right-hand flank of the German forces and advanced towards the Somme river and to the French Atlantic coast.

[1]: 22 After the successful conclusion of the Western campaign, the army group initially remained on occupation duty in German-occupied France, but was redeployed to German-occupied Poland starting on 16 August 1940, where it took charge of German forces in East Prussia and the General Government, in proximity to the demarcation line with the Soviet Union.

Günther von Kluge assumed command of the army group on 19 July 1944, but was soon replaced by Walter Model on 17 August.

[1]: 23  Moving to the Low Countries, Model with his HQ located at Oosterbeek close to Arnhem, was surprised on 17 September by the start of Operation Market Garden.