Everything about Battle Of The Frontiers totally explained
The
Battle of the Frontiers was a series of
battles fought along the eastern frontier of
France and in southern
Belgium shortly after the outbreak of the
First World War. The battles represented a collision between the
military strategies of the French
Plan XVII and the
German Schlieffen Plan. The
British Expeditionary Force (BEF) fought a relatively minor
battle at Mons which, by virtue of its position facing the critical right wing of the invading German army, had a significance that far exceeded the number of men engaged or casualties inflicted. The defeat of the French offensive in the
Battle of the Ardennes led to a general retreat to the
Marne River where the French and British forces regrouped for the defense of
Paris.
Prelude
The objective of the French Plan XVII was to recapture the provinces of
Alsace-Lorraine, lost in the
Franco-Prussian War of
1870, pinning the German forces on the
Rhine, and to attack the German centre through the southern
Ardennes. In opposition to Plan XVII, the German Schlieffen Plan anticipated the target of the French assault and determined to remain there on the defensive, holding the Alsace-Lorraine front with the minimal possible force needed to keep the bulk of the French engaged there. The main German force would be on the right wing, sweeping through neutral Belgium and then into France, descending on Paris and executing a massive envelopment manoeuvre which would trap the French army between the two German forces and lead to its rapid annihilation. The German
divisions would then rapidly turn about to face France's ally,
Russia, on the
Eastern Front. The German plan falsely assumed
Britain, not formally allied with either side, would remain neutral in the conflict, and deemed the relatively small British regular army too small to be of any impact even if it did get involved.
France's frontier defences were based on a fortified zone from
Verdun to
Toul and isolated fortresses such as
Épinal and
Belfort. To the north, France relied on the impassable terrain of the central Ardennes forest and the promise of Belgian neutrality. Thus Plan XVII called for a two-pronged offensive, north and south of the Verdun-Toul line. In the south, the
First and
Second Armies would attack into Lorraine. In the north the
Third,
Fourth and
Fifth Armies would attack through the southern Ardennes towards
Luxembourg. On the left flank of the Fifth Army, facing the Belgian frontier, was the BEF which concentrated near the fortress town of
Maubeuge.
On the French frontier, the German forces roughly matched the French in numbers and disposition, even to the point of being divided north and south of a fortified zone between
Metz and
Thionville. However, in Belgium to the north, opposing the French Fifth Army and BEF, were the German
First,
Second and
Third Armies, forming the mass of Schlieffen's right wing.
Germany invaded Belgium on
4 August,
1914 and began to
besiege Liège. Despite evidence of German forces massing east of Liège, General
Joseph Joffre, the French Commander-in-Chief, dismissed the threat to his northern flank and persisted with Plan XVII. Indeed, Joffre welcomed the prospect of a strong German right, which would mean the German left wing against which his offensives were directed would be weaker — in
1913, General
Nöel de Castelnau, then Deputy Chief of the French General Staff, declared a German attack through Flanders was "so much the better for us" and that opinion still prevailed amongst the French high command. Even as the German armies began flowing through Belgium in mid-August, Joffre's Assistant Chief of Staff, General
Henri Berthelot said:
» "If the Germans commit the imprudence of an enveloping manoeuvre through northern Belgium, so much the better! The more men they've on their right wing the easier it'll be for us to break through their centre."
Alsace & Lorraine
On
7 August the first French attack of the war, known as the
Battle of Mulhouse, began in the south when the
French VII Corps, along with 2 infantry and 1 cavalary division, advanced into southern
Alsace with the objective of seizing the towns of
Mulhouse and
Colmar. Mulhouse was taken without a fight on
8 August, causing enormous celebrations in France, however a German counterattack commenced on
9 August, forcing the French to begin a slow withdraw which was finished the next day.Joffre sent a division to reinforce the attacking force, but it arrived too late to prevent the fall of Mulhouse . In response to the repulse of VII Corps and the other divisions, Joffre sent four additional divisions to form the "Army of Alsace" under the command of retired general
Paul Pau.
The main French offensive in the south, known as the
Battle of Lorraine, began on
14 August when the First Army of General
Auguste Dubail advanced on
Sarrebourg while the Second Army of General de Castelnau headed towards
Morhange. The French moves were welcomed by the German
Sixth and
Seventh Armies under the combined command of
Crown Prince Rupprecht — Rupprecht was in charge of the German forces assigned to meet and engage the French assault in the centre until they could be enveloped by the encircling German right wing. The German rearguards, equipped with
machine guns, inflicted heavy casualties on the French
infantry, still wearing their 19th-century style uniform of blue coat and red trousers.
Crown Prince Rupprecht, dissatisfied with the defensive role assigned to him, petitioned his superiors to allow him a counter-offensive. This ran counter to the overall German plan of luring the French in, but on Rupprecht's repeated insistence the policy of defense in the centre was abandoned and a counter-offensive launched on
20 August against the French Second Army which was thrown back into France. This left the French First Army's flank in the air, forcing it to withdraw as well. Pau's Army of Alsace also had to pull back, despite having retaken Mulhouse. By
22 August, the French forces were back on their start lines along the
Moselle River.
The Schlieffen Plan, here and elsewhere on the front, now began to unravel as Crown Prince Rupprecht launched a full-scale offensive between Toul and
Épinal, starting on
23 August. However, the French forces were now occupying prepared defences and withstood the German attack, which lasted for four days. German forces locked into Rupprecht's offensive were therefore unavailable for the later fighting on the Marne when they may have proved decisive.
Ardennes offensive
Under Plan XVII, the French offensive against the German centre through the lower Ardennes was to involve the Third, Fourth and Fifth French armies, but by the time the offensive was due to start Plan XVII was beginning to crumble. General
Charles Lanrezac, commander of the northern-most Fifth Army, alarmed by German progress in Belgium, sought permission to realign his forces away from the Ardennes and towards Belgium, shifting west into the angle between the
Sambre and
Meuse rivers. Joffre remained dismissive of the threat but on
12 August he allowed Lanrezac to move
I Corps west to
Dinant on the Meuse. When on
15 August Lanrezac reported German forces attacking Dinant, Joffre finally acquiesced, ordering the bulk of the Fifth Army to move north-west and take up positions behind the Sambre. In addition to the loss of most of the Fifth Army from the Ardennes offensive, Joffre also withdrew divisions to reinforce the Lorraine front following Rupprecht's counter-offensive.
The
Battle of the Ardennes commenced on
21 August with the attack of General
Pierre Ruffey's
Third Army towards
Briey while the
Fourth Army of General
Fernand de Langle de Cary advanced on
Neufchâteau. The German
Fourth Army (
Albrecht, Duke of Württemberg) and
Fifth Army (
Crown Prince Wilhelm) had been making a methodical advance through the Ardennes since
19 August and on 21 August, the advance screens of the two forces collided in a confused series of
skirmishes.
The main forces came into contact on
22 August and in most cases the French infantry, attacking with a surplus of
élan but a shortage of supporting artillery, were defeated by superior German
tactics, particularly in their use of entrenchments,
machine guns and heavy artillery. There were isolated French successes, notably at
Virton by the
VI Corps but, by the evening of
23 August the French Third and Fourth Armies were in chaotic retreat, falling back on the line of the Moselle through
Sedan,
Stenay and
Verdun.
Charleroi and Mons
By
20 August, Lanrezac's
Fifth Army had begun to concentrate on a 40
km front along the Sambre, centred on
Charleroi and extending east to the Belgian fortress of
Namur. On his left, the
Cavalry Corps of General Sordet linked the Fifth Army with the
British Expeditionary Force at
Mons. Lanrezac's army of 15 divisions, weakened by the transfer of troops to Lorraine, was confronted by the 38 German divisions from the
Second Army (General
Karl von Bülow) and
Third Army moving south-west.
Nevertheless, Joffre ordered Lanrezac to attack across the Sambre. Before he could act on the morning of
21 August, the German Second Army launched the
Battle of Charleroi with assaults across the Sambre, establishing two
bridgeheads which the French, lacking artillery, were unable to reduce. Bülow attacked again on
22 August with three
corps against the entire Fifth Army front. Fighting continued on
23 August when the French centre around Charleroi began to fall back.
Meanwhile the German Third Army had crossed the Meuse and launched a frontal attack against the French right, held by a corps commanded by General
Louis Franchet d'Esperey. The Third Army attack threatened to cut off Lanrezac's line of retreat but Franchet d'Esperey's force stopped the German advance and delivered a successful counter-attack. However, with the evacuation of Namur and news of the French Fourth Army retreating from the Ardennes, Lanrezac ordered a withdrawal.
On
22 August, BEF patrols encountered the cavalry screen of the
German First Army of General
Alexander von Kluck near
Soignies south-west of
Brussels. The British Commander-in-Chief
Field Marshal Sir John French initially ordered an attack, believing he was confronted by an inferior force. In truth the BEF of five infantry and one cavalry divisions, 70,000 men, faced over 160,000 German troops — the mass of Schlieffen's right wing. Fortunately for the British, on the night of 22 August French chose to take up defensive positions along the Mons-Condé Canal.
The
Battle of Mons began on
23 August when Von Kluck, required to maintain contact with Bülow's Second Army on his left, launched a frontal attack on the British line with the main weight falling on the
British II Corps of General
Horace Smith-Dorrien. The massed
rifle fire of the professional British soldiers — the
Old Contemptibles — inflicted heavy casualties on the Germans who attacked
en masse over terrain devoid of cover. The British held up the German advance until the evening when, now aware of the size of the opposing force, and with Sordet's cavalry in retreat leaving the right flank exposed, they began retiring to a second defensive line. For the moment, Von Kluck made no attempt at pursuit, allowing the BEF to disengage on
24 August.
Aftermath
With the failure of Plan XVII, the French and British armies began the
Great Retreat to the
Marne River, pivoting on the fortress of
Verdun. Fearing annihilation,
Sir John French favoured withdrawing the BEF to the coast of the
English Channel from where it could be evacuated but the British
Secretary of State for War,
Lord Kitchener, despite having never favoured the BEF's role alongside the French army, now insisted they remain in contact.
The Schlieffen Plan, while still on course, was beginning to come to pieces under the tentative control of
Moltke. The opening of the
Russian offensive in
East Prussia and the unforeseen attack in
Lorraine had drained the German right wing that was descending on Paris. Von Kluck's decision to take his First Army east of the French capital exposed his right flank which the Allies exploited in the
First Battle of the Marne in early September, halting the German advance.
For the French, their hope of a swift, decisive victory had evaporated and they now sought to avoid defeat. For Joffre, the reason for the failure of Plan XVII lay with his subordinates, claiming defeat stemmed from "grand shortcomings on the part of commanders." Any generals, of corps or division, who in Joffre's opinion had failed to perform were ruthlessly sacked. Despite the wisdom of his decision to retreat instead of counter-attack on
23 August, General Lanrezac was sent into retirement and replaced by Franchet d'Esperey, starting his rapid rise through the ranks.
By the end of August, the French Army had suffered 75,000 dead of which 27,000 were killed on
22 August alone, making it a day to rival the
first day on the Somme for bloodshed. Total French
casualties for the first month of the war were 260,000 of which 140,000 were sustained during the climactic final four days of the battle of the Frontiers.
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