Battle of the Somme
The Battle of the Somme, also known as the Somme offensive, was a battle of the First World War fought by the armies of the British Empire and the French Republic against the German Empire. It took place between 1 July and 18 November 1916 on both sides of the upper reaches of the river Somme in France. The battle was intended to hasten a victory for the Allies. More than three million men fought in the battle, of whom more than one million were either wounded or killed, making it one of the deadliest battles in human history.
The French and British had planned an offensive on the Somme during the Chantilly Conference in December 1915. The Allies agreed upon a strategy of combined offensives against the Central Powers in 1916 by the French, Russian, British and Italian armies, with the Somme offensive as the Franco-British contribution. The French army was to undertake the main part of the Somme offensive, supported on the northern flank by the Fourth Army of the British Expeditionary Force. When the Imperial German Army began the Battle of Verdun on the Meuse on 21 February 1916, French commanders diverted many of the divisions intended for the Somme and the "supporting" attack by the British became the principal effort. British forces comprised a mixture of wartime volunteers from the Territorial Force and Kitchener's Army with the remains of the pre-war army.
On the first day on the Somme the German 2nd Army suffered a serious defeat opposite the French Sixth Army, from Foucaucourt-en-Santerre south of the Somme to Maricourt on the north bank and by the Fourth Army from Maricourt to the vicinity of the Albert–Bapaume road. The 57,470 casualties suffered by the British, including 19,240 killed, were the worst in the history of the British Army. Most of the British casualties were suffered on the front between the Albert–Bapaume road and Gommecourt to the north, which was the area where the principal German defensive effort was made. The battle became notable for the importance of air power and the first use of the tank in September but these were a product of new technology and proved unreliable.
At the end of the battle, British and French forces had penetrated into German-occupied territory along the majority of the front, their largest territorial gain since the First Battle of the Marne in 1914. The operational objectives of the Anglo-French armies were not achieved, as they failed to capture Péronne and Bapaume, where the German armies maintained their positions over the winter. British attacks in the Ancre valley resumed in January 1917 and forced the Germans into local withdrawals in February before the strategic retreat by about in Operation Alberich to the Siegfriedstellung in March 1917. Debate continues over the necessity, significance and effect of the battle.
Strategic developments
Allied war strategy for 1916 was decided at the Chantilly Conference from 6 to 8 December 1915. Simultaneous offensives on the Eastern Front by the Russian army, on the Italian Front by the Italian army and on the Western Front by the Franco-British armies were to be carried out to deny time for the Central Powers to move troops between fronts during lulls. In December 1915, General Sir Douglas Haig replaced Field Marshal Sir John French as Commander-in-Chief of the BEF. Haig favoured a British offensive in Flanders, close to BEF supply routes, to drive the Germans from the Belgian coast and end the U-boat threat from Belgian waters. Haig was not formally subordinate to Marshal Joseph Joffre but the British played a lesser role on the Western Front and complied with French strategy.In January 1916, Joffre had agreed to the BEF making its main effort in Flanders but in February 1916 it was decided to mount a combined offensive where the French and British armies met, astride the Somme River in Picardy before the British offensive in Flanders. A week later the Germans began the Battle of Verdun against the French army. The costly defence of Verdun forced the army to divert divisions intended for the Somme offensive, eventually reducing the French contribution to in the Sixth Army, against divisions. By 31 May, the ambitious Franco-British plan for a decisive victory had been reduced to a limited offensive to relieve pressure on the French at Verdun and inflict attrition on the German armies in the west.
The Chief of the German General Staff, Erich von Falkenhayn, intended to end the war by splitting the Anglo-French Entente in 1916, before its material superiority became unbeatable. Falkenhayn planned to defeat the large number of reserves which the Entente could move into the path of a breakthrough, by threatening a sensitive point close to the existing front line and provoking the French into counter-attacking German positions. Falkenhayn chose to attack towards Verdun to take the Meuse heights and make Verdun untenable. The French would have to conduct a counter-offensive on ground dominated by the German army and ringed with masses of heavy artillery, leading to huge losses and bringing the French army close to collapse. The British would mount a hasty relief offensive and suffer similar losses. Falkenhayn expected the relief offensive to fall south of Arras against the 6th Army and be destroyed. Despite the certainty by mid-June of an Anglo-French attack on the Somme against the 2nd Army, Falkenhayn sent only four divisions, keeping eight in the western strategic reserve.
No divisions were taken from the Sixth Army, despite it holding a shorter line with divisions and three of the divisions in OHL reserve behind the 6th Army. The maintenance of the strength of the 6th Army, at the expense of the 2nd Army on the Somme, indicated that Falkenhayn intended the counter-offensive against the British to be made north of the Somme front, once the British offensive had been shattered. If such Franco-British defeats were not enough, Germany would attack the remnants of both armies and end the western alliance for good. The unexpected length of the Verdun offensive, and the need to replace many drained units at Verdun, depleted the German strategic reserve placed behind the 6th Army, which held the Western Front from Hannescamps, south-west of Arras to St Eloi, south of Ypres and reduced the German counter-offensive strategy north of the Somme to one of passive and unyielding defence.
Battle of Verdun
The Battle of Verdun began a week after Joffre and Haig agreed to mount an offensive on the Somme. The German offensive at Verdun was intended to threaten the capture of the city and induce the French to fight an attrition battle, in which German advantages of terrain and firepower would cause the French disproportionate casualties. The battle changed the nature of the offensive on the Somme, as French divisions were diverted to Verdun, and the main effort by the French diminished to a supporting attack for the British. German overestimation of the cost of Verdun to the French contributed to the concentration of German infantry and guns on the north bank of the Somme. By May, Joffre and Haig had changed their expectations of an offensive on the Somme, from a decisive battle to a hope that it would relieve Verdun and keep German divisions in France, which would assist the Russian armies conducting the Brusilov Offensive. The German offensive at Verdun was suspended in July, and troops, guns, and ammunition were transferred to Picardy, leading to a similar transfer of the French Tenth Army to the Somme front. Later in the year, the Franco-British were able to attack on the Somme and at Verdun sequentially and the French recovered much of the ground lost on the east bank of the Meuse in October and December.Brusilov offensive
The Brusilov offensive on the Eastern Front absorbed the extra forces that had been requested on 2 June by Fritz von Below, commanding the German Second Army, for a spoiling attack on the Somme. On 4 June, Russian armies attacked on a front, from the Romanian frontier to Pinsk and eventually advanced, reaching the foothills of the Carpathian mountains, against German and Austro-Hungarian troops of Armeegruppe von Linsingen and Armeegruppe Archduke Joseph. During the offensive the Russians inflicted losses including prisoners. Three divisions were ordered from France to the Eastern Front on 9 June and the spoiling attack on the Somme was abandoned. Only four more divisions were sent to the Somme front before the Anglo-French offensive began, bringing the total to divisions. Falkenhayn and then Hindenburg and Ludendorff, were forced to send divisions to Russia throughout the summer to prevent a collapse of the Austro-Hungarian army and then to conduct a counter-offensive against Romania, which declared war against the Central Powers on 27 August. In July there were divisions on the Western Front and in Russia and in November there were in the west and in the east.Tactical developments
The original British Expeditionary Force of six divisions and the Cavalry Division, had lost most of the British pre-war regulars in the battles of 1914 and 1915. The bulk of the army was made up of volunteers of the Territorial Force and Kitchener's Army, which had begun forming in August 1914. Rapid expansion created many vacancies for senior commands and specialist functions, which led to many appointments of retired officers and inexperienced newcomers. In 1914, Douglas Haig had been a lieutenant-general in command of I Corps and was promoted to command the First Army in early 1915 and then the BEF in December, which eventually comprised five armies with sixty divisions. The swift increase in the size of the army reduced the average level of experience within it and created an acute equipment shortage. Many officers resorted to directive command to avoid delegating to novice subordinates, although divisional commanders were given great latitude in training and planning for the attack of 1 July, since the heterogeneous nature of the 1916 army made it impossible for corps and army commanders to know the capacity of each division.Despite considerable debate among German staff officers, Erich von Falkenhayn continued the policy of unyielding defence in 1916. Falkenhayn implied after the war that the psychology of German soldiers, shortage of manpower and lack of reserves made the policy inescapable, as the troops necessary to seal off breakthroughs did not exist. High losses incurred in holding ground by a policy of no retreat were preferable to higher losses, voluntary withdrawals and the effect of a belief that soldiers had discretion to avoid battle. When a more flexible policy was substituted later, decisions about withdrawal were still reserved to army commanders. On the Somme front, Falkenhayn's construction plan of January 1915 had been completed. Barbed wire obstacles had been enlarged from one belt wide to two, wide and about apart. Double and triple thickness wire was used and laid high. The front line had been increased from one trench line to a position of three lines apart, the first trench occupied by sentry groups, the second for the bulk of the front-trench garrison and the third trench for local reserves. The trenches were traversed and had sentry-posts in concrete recesses built into the parapet. Dugouts had been deepened from to, apart and large enough for. An intermediate line of strongpoints about behind the front line was also built. Communication trenches ran back to the reserve line, renamed the second position, which was as well-built and wired as the first position. The second position was beyond the range of Allied field artillery, to force an attacker to stop and move field artillery forward before assaulting the position.