First Army (United Kingdom)

Army · United Kingdom · from December 26, 1914 · inactive December 31, 1918 – 1942

Formed under Douglas Haig, later Henry Horne; it held Artois and French Flanders and ended the war at Mons.

February 19, 1943 – February 25, 1943 II Corps (United States) Under this formation at Battle of Kasserine Pass (Wikipedia infobox)
February 19, 1943 – February 25, 1943 6th Armoured Division (United Kingdom) Under this formation at Battle of Kasserine Pass (Wikipedia infobox)

December 26, 1914 – March 9, 1915 Holds from Armentières to La Bassée Map
March 10, 1915 – September 24, 1915 Battle of Neuve Chapelle Attacks at Neuve Chapelle Map
September 25, 1915 – April 8, 1917 Third Battle of Artois Attacks at Loos Map
April 9, 1917 – April 8, 1918 Battle of Vimy Ridge Takes Vimy Ridge Map
April 9, 1918 Battle of the Lys (1918) Holds the Lys Map
November 11, 1918 Takes Mons on the last day Map
September 1, 1939 – September 2, 1945 World War II
November 8–16, 1942 Operation Torch
November 17, 1942 – May 13, 1943 Tunisian campaign
February 14–17, 1943 Battle of Sidi Bou Zid
February 19–25, 1943 Battle of Kasserine Pass
March 23, 1943 Battle of El Guettar
July 9, 1943 – May 2, 1945 Italian campaign
July 9 – August 17, 1943 Allied invasion of Sicily
September 3–16, 1943 Allied invasion of Italy
December 8–17, 1943 Battle of San Pietro Infine
May 11–23, 1944 Operation Diadem
June 6, 1944 – July 1944 Invasion of Normandy
July 25–31, 1944 Operation Cobra
August 25 – December 31, 1944 Operation Olive
August 25, 1944 – March 7, 1945 Allied advance from Paris to the Rhine
October 2–21, 1944 Battle of Aachen
December 16, 1944 – January 25, 1945 Battle of the Bulge
December 26, 1944 Battle of Elsenborn Ridge
March 22 – May 8, 1945 Western Allied invasion of Germany
April 9–21, 1945 Battle of Bologna
November 1, 1955 – April 30, 1975 Vietnam War