Question: Where did Britain and France face an uninterrupted line of entrenched German forces, from Lorraine to where?
About the article "World War I", section "Trench warfare begins".

Candidate passages:
Western Front.
Trench warfare begins.
Military tactics before World War I had failed to keep pace with advances in technology.
These advances allowed for impressive defence systems, which out-of-date military tactics could not break through for most of the war.
Barbed wire was a significant hindrance to massed infantry advances.
Artillery, vastly more lethal than in the 1870s, coupled with machine guns, made crossing open ground extremely difficult.
Commanders on both sides failed to develop tactics for breaching entrenched positions without heavy casualties.
In time, however, technology began to produce new offensive weapons, such as gas warfare and the tank.
Just after the First Battle of the Marne (5–12 September 1914), both Entente and German forces each continually sought to outflank the other by manoeuvering to the north: this series of manoeuvres became known as the "Race to the Sea".
When these outflanking efforts failed, Britain and France soon found themselves facing an uninterrupted line of entrenched German forces from Lorraine to Belgium's coast.
Britain and France sought to take the offensive, while Germany defended the occupied territories.
Consequently, German trenches were much better constructed than those of their enemy; Anglo-French trenches were only intended to be "temporary" before their forces broke through German defences.
Both sides tried to break the stalemate using scientific and technological advances.
On 22 April 1915, at the Second Battle of Ypres, the Germans (violating the Hague Convention) used chlorine gas for the first time on the Western Front.
Several types of gas soon became widely used by both sides, and though it never proved a decisive, battle-winning weapon, poison gas became one of the most-feared and best-remembered horrors of the war.
Tanks were first used in combat by the British during the Battle of Flers-Courcelette (part of the wider Somme offensive) on 15 September 1916, with only partial success.
However, their effectiveness would grow as the war progressed; the Germans employed only very small numbers of their own design, supplemented by captured Allied tanks.
Metz is a heavily fortified city, located between the rivers Moselle and Seille.
The fortifications of Metz consist of several forts and observation posts with connecting entrenchments and tunnels.
The city had fallen to the German forces when France was defeated in 1940.
Following the fall of France, the city was immediately annexed to the Third Reich.
Most of the Nazi dignitaries assumed it was obvious that Metz, where so many German army officers were born, was a German city.
At that time, the Wehrmacht did not consider it an important location and the city's defenses were reduced with many guns and equipment removed.
However, as the Allied forces advanced rapidly into German-held territory following the Normandy landings, Metz became an important location for the German command to organize its defenses and attempt to contain the Allied advance.
By the end of August 1944, German forces in Lorraine had managed to reestablish a defensive line and the U.S. Third Army had come to a halt in face of the German defenses, resulting in a brief pause of operations in this area of the western front.
According to an order issued by Hitler in March 1944, fortress commanders were ordered to allow their forts to be surrounded if necessary and hold them, surrendering only on the approval of the Führer.
Metz was required to follow this order by early September, since the U.S. Third Army led by General George S. Patton had reached Verdun and was posing a threat to the Sarre region of Germany.
The German command intended to obtain more time for the strengthening of the West Wall through this strategy.
The defense was undertaken by the German First Army, commanded by General Otto von Knobelsdorff.
The number of German troops positioned in the vicinity of Metz was equivalent to four and a half divisions. 
The Hadfield-Spears Ambulance Unit was an Anglo-French volunteer medical unit which served initially with the 4th French army in Lorraine, eastern France, during the Second World War from February 1940 until it was forced to retreat on 9 June ahead of the German advance.
Its official French designation at that time was Ambulance Chirurgical Légère de Corps d’Armée 282.
The unit made its way across France via Bordeaux to Arcachon from where it was evacuated back to Britain, arriving at Plymouth on 26 June.
The unit re-grouped and re-equipped in Britain before sailing on 20 March 1941 for the Middle East, landing at Suez on 2 May.
Under the designation of HCM (Hôpital chirurgical mobile) 3 Ambulance Hadfield-Spears, it was attached to the Free French forces (1st Free French Division) in the Middle East, North Africa, Italy and France before being dissolved in Paris in June 1945 on the order of General Charles de Gaulle. 
France was part of the Allied force that occupied the Rhineland following the Armistice.
Foch supported Poland in the Greater Poland Uprising and in the Polish-Soviet War and France also joined Spain during the Rif War.
From 1925 until his death in 1932, Aristide Briand, as prime minister during five short intervals, directed French foreign policy, using his diplomatic skills and sense of timing to forge friendly relations with Weimar Germany as the basis of a genuine peace within the framework of the League of Nations.
He realized France could neither contain the much larger Germany by itself nor secure effective support from Britain or the League.
As a response to the failure of the Weimar Republic to pay reparations in the aftermath of World War I, France occupied the industrial region of the Ruhr as a means of ensuring repayments from Germany.
In the 1920s, France established an elaborate system of border defences called the Maginot Line, designed to fight off any German attack.
(Unfortunately, the Maginot Line did not extend into Belgium, where Germany attacked in 1940.)
Military alliances were signed with weak powers in 1920–1921, called the "Little Entente".
The French economy fell into the doldrums during the worldwide Great Depression after 1929.
Leon Blum, leading the Popular Front, brought together Socialists and Communists to become Prime Minister from 1936 to 1937; he was the first Jew to lead France.
During the Spanish Civil War (1936–1939) he did not support the Spanish Republicans because of the French internal political context of complex alliances and risk of war with Germany and Italy.
Appeasement of Germany, in cooperation with Britain, was the policy after 1936, as France sought peace even in the face of Hitler's violations of the Versailles treaty and his escalating demands.
Édouard Daladier refused to go to war against Germany and Italy without British support as Neville Chamberlain wanted to save peace at Munich in 1938. 
War plans.
Belgian military planning was based on an assumption, that other powers would eject an invader but the likelihood of a German invasion did not lead to France and Britain being seen as allies or for the Belgian government intending to do more than protect its independence.
The Anglo-French Entente (1904) had led the Belgians to perceive that the British attitude to Belgium had changed and that it was seen as a British protectorate.
A General Staff was formed in 1910 but the , Lieutenant-Général Harry Jungbluth was retired on 30 June 1912 and not replaced until May 1914 by Lieutenant-General Chevalier de Selliers de Moranville who began planning for the concentration of the army and met railway officials on 29 July.
Belgian troops were to be massed in central Belgium, in front of the National redoubt of Belgium ready to face any border, while the Fortified Position of Liège and Fortified Position of Namur were left to secure the frontiers.
On mobilization, the King became Commander-in-Chief and chose where the army was to concentrate.
Amid the disruption of the new rearmament plan the disorganised and poorly trained Belgian soldiers would benefit from a central position to delay contact with an invader but it would also need fortifications for defence, which were on the frontier.
A school of thought wanted a return to a frontier deployment in line with French theories of the offensive.
Belgian plans became a compromise in which the field army concentrated behind the Gete river with two divisions forward at Liège and Namur.