Battle of the Frontiers
The Battle of the Frontiers (French: Bataille des Frontières, German: Grenzschlachten, Dutch: Slag der Grenzen) comprised battles fought along the eastern frontier of France and in southern Belgium, shortly after the outbreak of the First World War. The battles resolved the military strategies of the French Chief of Staff General Joseph Joffre with Plan XVII and an offensive adaptation of the German Aufmarsch II deployment plan by Helmuth von Moltke the Younger. The German concentration on the right (northern) flank, was to wheel through Belgium and attack the French in the rear.
The German advance was delayed by the movement of the French Fifth Army (General Charles Lanrezac) towards the north-west to intercept them and the presence of the British Expeditionary Force (BEF) on the French left. The Franco-British troops were driven back by the Germans, who were able to invade northern France. French and British rearguard actions delayed the Germans, allowing the French time to transfer forces on the eastern frontier to the west to defend Paris, culminating in the First Battle of the Marne.
Prelude[edit]
French preparations[edit]
Joseph Joffre, who had been Commander-in-Chief of the French army since 1911 and the Minister of War, Adolphe Messimy met on 1 August, to agree that the military conduct of the war should exclusively be the responsibility of the Commander-in-Chief. On 2 August, as small parties of German soldiers crossed the French border, Messimy told Joffre that he had the freedom to order French troops across the German but not the Belgian frontier. Joffre sent warning orders to the covering forces near the frontier, requiring the VII Corps to prepare to advance towards Mühlhausen (Mulhouse) to the north-east of Belfort and XX Corps to make ready to begin an offensive towards Nancy. As soon as news arrived that German troops had entered Luxembourg, the Fourth Army was ordered to move between the Third and Fifth armies, ready to attack to the north of Verdun. Operations into Belgium were forbidden, to deny the Germans a pretext until 4 August, when it was certain that German troops had already violated the Belgian border. To comply with the Franco-Russian Alliance, Joffre ordered an invasion of Alsace-Lorraine for 14 August, although anticipating a German offensive through Belgium.[10]
On 8 August, General Instruction No. 1 had ordered the Fifth Army to take a position on the left of the Fourth Army, ready to attack the southern flank of German force advancing from Mézières and Mouzon, through the difficult terrain in between. All four corps covered this front until 12 August, when Joffre allowed General Charles Lanrezac to move I Corps north to Givet to oppose a potential German attempt to cross the Meuse between Givet and Namur 35 km (22 mi) further north, which extended the army front to 80 km (50 mi). As Lanrezac became aware of the size of the German force in Belgium and wanted to reinforce the left flank by moving to Namur, Joffre refused to allow the army front to be extended to 110 km (68 mi) and ordered Lanrezac to keep the army in a central position near Mézières, ready to oppose a German offensive from Mouzon to Namur. On 14 August Joffre and Lanrezac met but Joffre considered that only a few German cavalry and infantry parties had crossed the Meuse. With the BEF moving to Maubeuge and Hirson a redeployment of the Fifth Army would disrupt the deployment of the other armies. On 14 August a new intelligence report showed eight German corps between Luxembourg and Liège and by the next day Joffre allowed the move of the Fifth Army north, to operate beyond the Meuse. The XI Corps was transferred to the Fourth Army and the XVIII Corps was moved from the Third Army to the Fifth Army, which was made responsible for the defence of Maubeuge.[11]
Joffre began to dismiss commanders in early August, beginning with the VII Corps commander Bonneau and by 6 September had removed two army, ten corps and 38 divisional commanders, by transferring them to Limoges (Limogé). The VII Corps in the south was reinforced by two divisions, a cavalry division and the First Group of Reserve Divisions. The corps was renamed the Army of Alsace, to relieve the First Army of concern about Alsace during the operations in Lorraine. Two corps were removed from the Second Army and became a strategic reserve.[12] Joffre met Sir John French on 16 August and learned that the British could be ready by 24 August, Joffre also arranged for Territorial divisions to cover the area from Maubeuge to Dunkirk. The German siege of the Liège forts ended on 16 August and the 1st and 2nd armies with twelve corps and the 3rd Army with four corps began to advance behind cavalry screens. On 18 August, Joffre ordered the Fifth Army to prepare for a German offensive on both banks of the Meuse or to meet a small force on the north bank. The Fifth Army began to move towards Namur, in the angle of the Meuse and Sambre rivers on 19 August, which required a march of 100 km (62 mi) by some units.[13]
French plan[edit]
On 5 August, Joffre ordered an offensive by the VII Corps, on the right flank of the First Army, to begin on 7 August towards Mulhouse. The capture of the 2nd Army order of battle on 7 August, convinced Joffre that the strength of the German forces on the flanks had left the centre weak and vulnerable to an offensive towards Neufchâteau and Arlon.[14] On 8 August, Joffre issued General Instruction No. 1, containing his strategic intent, which was to destroy the German army rather than capture ground. The offensive into Alsace and that by the First and Second armies into Lorraine, would pin down German forces and attract reinforcements, as the main offensive further north drove in the German centre and outflanked the German forces in Belgium from the south. Joffre expected that the attack into the German centre would meet little resistance. The First and Second armies would advance south of the German fortified area from Metz–Thionville, with the Fourth Reserve Group guarding the northern flank near Hirson, to watch the Chimay Gap and deflect a German attack from the north or east. The strategy assumed that the main German force would be deployed around Luxembourg and from Metz–Thionville, with smaller forces in Belgium. On 9 August, an intelligence report had one German active corps near Freiburg close to the Swiss border, three near Strasbourg, four in Luxembourg to the north of Thionville and six from Liège in Belgium, towards the north end of Luxembourg, which left five corps un-located. The French general staff inferred that they were between Metz-Thionville and Luxembourg, ready to advance towards Sedan or Mézières.[15]
Joffre set 14 August as the date when the First and Second armies were to invade Lorraine between Toul and Épinal, south of the German fortified area of Metz-Thionville. The First Army was to attack in the south with four corps, towards Sarrebourg 60 km (37 mi) east of Nancy and Donon, 25 km (16 mi) south of Sarrebourg. Passes in the Vosges to the south of Donon were to be captured before the main advance began. The Second Army was to attack towards Morhange 45 km (28 mi) north-east of Nancy, with two corps north of the First Army and three advancing successively behind the left flank of the corps to the south, to counter a German attack from Metz. The French offensive was complicated by the two armies diverging as they advanced, on difficult terrain particularly in the south, the combined fronts eventually being 150 km (93 mi) wide.[16] The advances of the First and Second armies were to attract German forces towards the south, while a French manoeuvre took place in Belgium and Luxembourg, to pierce a weak point in the German deployment and then destroy the main German armies.[17]
News that German forces were attacking towards the Meuse bridges south of Namur, led Joffre to expect a German attack from Mézières to Givet, 40 km (25 mi) further north, intended to envelop the French northern flank and another force to try to cross the Meuse from Montmédy to Sedan. On 12 August, Joffre allowed Lanrezac to move the I Corps west to Dinant on the Meuse and on 15 August, Joffre ordered the bulk of the Fifth Army to move north-west behind the Sambre. No large German force was expected to cross to the north of the Meuse, which made the French general staff certain that the German centre was weaker than expected. On 18 August, Joffre directed the Third, Fourth and Fifth armies, together with the Belgians and British, to attack the German armies around Thionville and Luxembourg, where 13–15 German corps were thought to have assembled. The Third and Fourth armies were to defeat German forces between Thionville and Bastogne, as they attacked westwards towards Montmédy and Sedan. The Fifth Army was to intercept German forces advancing towards Givet and then the Fourth Army was to swing north and attack the southern flank of the German armies. The Third and Fourth armies would defeat decisively the main German armies in the west and for this, two more corps were added to the four in the Fourth Army, taken from the flanking armies.[17]
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