The 1ere Armée , also Première armée française ( German 1st Army ) emerged in the final phase of the Second World War from the regular French B-Army, which was stationed in North Africa, and parts of the Armée française de la liberation (part of the Resistance ) under the Order from General Jean de Lattre de Tassigny . She took part in the Allied liberation of France (French called La Liberation ) as part of the landing in southern France, fought in the Rhone Valley , liberated Alsace and conquered parts of southwest Germany. Parts of the army were engaged in fighting in theAlps and Italy involved.
De Lattre came to Algiers from London on December 20, 1943 and took over command of the remnants of the regular army in French North Africa , the so-called B Army, on behalf of De Gaulle . From Corsica, which had been free from German and Italian occupiers since October 1943 , the invasion of Elba ( Operation Brassard ) took place on June 17, 1944 ; Command units of the Royal Navy supported the overall successful procedure.
The 6th Army Group , consisting of the 7th US Army under General Alexander M. Patch and the B Army, then carried out Operation Dragoon , the invasion of southern France . De Lattres troops landed in a second wave on August 16, 1944, taking Toulon and Marseille . On September 25, 1944, the French B Army was renamed the 1st (French) Army (there was a Provisional Government of the French Republic at that time ). Members of the Resistance, of the French resistance who wanted to continue the armed struggle, were incorporated into the 1st Army by De Lattre.
It followed from
- November 14-20 , 1944 : The Belfort fortifications are taken
- January 1 to 25, 1945 repulsed German attacks on Strasbourg
- January 19 to February 9, 1945: Battle of Colmar (French under Poche de Colmar )
After Paris and all of France had been liberated , the 1st Army crossed the Rhine near Speyer and Germersheim on March 30th to March 31st as part of the Allied expeditionary forces , occupied Karlsruhe (April 4th) and pushed over Freiburg on the Upper Rhine (April 21st ) and the Black Forest to the Swiss border before (April 27), as well as north to Stuttgart and further south along the Danube to Vorarlberg and Tyrol . It destroyed Freudenstadt (April 16/17) and then took Tübingen (April 18), Reutlingen (April 19),Esslingen am Neckar (April 21), Sigmaringen and Stuttgart (April 22).  The remnants of the French Vichy regime had been prisoners of Hitler in exile in Sigmaringen Castle since the summer of 1944 . Their planned arrest explains the thrust of part of the army.
The circumstances surrounding the destruction of Freudenstadt with mass rape are now regarded as war crimes , but are rarely discussed in public outside the region. De Lattre himself saw the destruction of Freudenstadt as just revenge.  In the first few days, the French troops committed mass rape, pillage and, in numerous cases, the killing of people who opposed them in the areas they occupied. The French officers let their troops have their way and after a few days intervened, sometimes drastically by executing soldiers without trial. Numerous local reports attest to this. In Reutlingen, the captain of the security service of the French army, Max Rouché - a professor of German studies in Bordeaux - had four German civilians executed as hostages on April 24, 1945 as reprisal of the suspected assassination death of a French soldier who probably died in a traffic accident . 
Between April 23 and 26, 1945, parts of the army got into fierce fighting with German troops who attempted to break through from the Black Forest to the east in the Blumberg area .
On 25 April 1945, the army reached Radolfzell am Bodensee , occupied on April 26, Konstanz and ended on 29 April 1945 after taking Markdorf war in southwest Germany. There were clashes between the Allies over Stuttgart , which was occupied by the French on April 21, against the will and the agreement with the American armed forces. It was not until July 8, 1945 that Stuttgart entered the American zone of occupation . 
The commander-in-chief of the 1st Army represented France at the Supreme Headquarters Allied Expeditionary Force (SHAEF) in Reims , including on May 7, 1945 and May 8, 1945 at the headquarters of Marshal Zhukov in Berlin at the German surrender to the anti-Hitler Coalition . He later represented France in the Allied Control Council in Berlin. De Lattre was relieved and promoted in August 1945. In 1952 the French government posthumously awarded him the honorary title of Marshal of France .
- 1st Corps under Henry Martin (since August 1, 1943)  , from September 1, 1944 under Antoine Bethouart
- 2nd Corps under Edgard de Larminat , later under Joseph de Goislard de Monsabert 
These corps were subordinate to five French infantry and three tank divisions in a changing composition:
- 1 re motorized infantry division (1 re DMI)
- 2 nd Moroccan infantry division (2 nd DIM)
- 3 e division of Algerian infantry (3 e DIA)
- 4 and division of Moroccan mountains (4 and DMM)
- 9 e division colonial infantry (9 e DIC)
- 1 re armored division (1 st DB)
- 2 a division blindée (2 e DB)
- 5 th Armored Division (5 th DB)
There were also various smaller units.
- Forces françaises libres (German Free French Armed Forces, FFL for short; during the German occupation of France)
- Military government and French zone of occupation in the south-west of Germany
- French armed forces (French Les forces armées françaises , today's French army)
- First French Army. Orders of the Day and Messages . Strasbourg 1945
- Texts by General de Lattre de Tassigny . Paris 1947
- History of the French 1st Army . Plon edition, 1949
- Reclaim: 1944–1945 . Texts collected and presented by Jean-Luc Barre. Plon, 1985
- Jean de Lattre de Tassigny. Tabular curriculum vitae in the LeMO ( DHM and HdG )
- Biography Lattre de Tassignies (French)
- Cf. Edgar Wolfrum, Peter Fässler, Reinhard Grohnert: Years of Crisis and Time to Break Up. P. 24 f.
- Bernard Destremau: Jean de Lattre de Tassigny , Flammarion, Paris, 1999, ISBN 978-2-08-067376-3
- Ian Kershaw : The End. Fight to the end. Nazi Germany 1944/45. Munich 2011, p. 417 and note 9
- Facts and background information on the shooting of the hostages in Reutling in 1945, Reutlinger General-Anzeiger from April 16, 2005, accessed on December 6, 2016
- E. Wolfrum, R. Grohnert: Liberation and occupation shock . The end of the war in the southwest in 1944/45 . In: Edgar Wolfrum , Peter Fässler, Reinhard Grohnert: Years of Crisis and A Time to Start , p. 25
- Henry Jules Jean Martin, 1888–1984, commander of the 87 e DIA, Marrakech division, and the 1 er DMM. Later commander of the XIX. Corps (Algeria, 1944–1946, then retired)
- Formed from the 1st division française libre (1st Mot. Infantry Division, French DMI of the FFL, also 1st DFL with 3 brigades. Since April 18, 1944 under Diego Brosset and from November 20, 1944 under Pierre Garbay , who later was deployed in Madagascar , Indochina, Dakar and Tunisia) and the 3rd Algerian Infantry Division and the 9th Cololonial Infantry Division (partly from Senegal)