question: What year was the the U.S. Third Army undertaking the Lorraine Campaign during World War II while the U.S. Fifth Army was engaged in Operation Diadem?
answer: 1944
context: Title: Lorraine Campaign
  Passage: 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:
  Title: Operation Diadem
  Passage: Operation Diadem, also referred to as the Fourth Battle of Monte Cassino or, in Canada, the Battle of the Liri Valley, was an offensive operation undertaken by the Allies of World War II (U.S. Fifth Army and British Eighth Army in May 1944, as part of the Italian Campaign of World War II.  "Diadem" was supported by air attacks called Operation Strangle.  The opposing force was the German 10th Army.
  Title: Courtney Hodges
  Passage: General Courtney Hicks Hodges (January 5, 1887 – January 16, 1966) was a decorated senior officer of the United States Army, most prominent for his role in World War II, in which he commanded the U.S. Third Army in the Western Europe Campaign.  In his career Hodges was a notable "mustang" officer, rising from private to general.
citations: Operation Diadem Lorraine Campaign