Lorraine Campaign is a term used by U.S. Army historians to describe operations of the U.S. Third Army in Lorraine during World War II from September 1 through December 18, 1944. Official U.S. Army campaign names for this period and location are Northern France and Rhineland. The term was popularized by the publication of a volume of the same name by the U.S. Army in 1950. As written by the volume's author:
Precise military terminology has been employed, except in those cases where clarity and economy of style have dictated usage of a more general nature. Thus, the Third Army operations in Lorraine are considered to be a "campaign" in the general sense of the term, despite the fact that the Department of the Army does not award a separate campaign star for these operations.
Although the term Lorraine Campaign is unofficial, it represents a more traditional use of the term "campaign" in that the battles described by the term were part of a larger operation that had a set goal. By contrast, the official U.S. Army campaign names refer to what were actually multiple campaigns and large military organizations with diverse goals.
Operationally, the term encompasses the assaults across the Moselle and Sauer Rivers, the battles of Metz and Nancy, and the push to the German frontier and the crossing of the Saar/Sarre River during the first half of December 1944.
The Lorraine Campaign consisted of three phases.
The Third Army, led by General Patton, lacking gasoline, was unable to swiftly take both Metz and Nancy, unlike the actions that characterized the rapid advance across France. After the battle of Arracourt following the fall of Nancy and the meeting engagement of Mairy, the Third Army had to pause and await resupply. For the OKW, stopping Patton was a priority that resulted in replacements and reinforcements for the German Fifth Panzer Army and First Army.