Operation Northwind (1944)
Operation Northwind (German: Unternehmen Nordwind) was the last major German offensive of World War II on the Western Front. Northwind was launched to support the German Ardennes offensive campaign in the Battle of the Bulge, which by late December 1944 had decisively turned against the German forces.
Source: Wikipedia — Operation Northwind (1944) (CC BY-SA 4.0)