Second Battle of the Somme (1918)

During the First World War, the Second Battle of the Somme of 1918 was fought on the Western Front from the end of the summer, in the basin of the Somme River. It was part of a series of successful counter-offensives in response to the German Spring Offensive, after a pause for redeployment and re-supply.

The most significant feature of the 1918 Somme battles was that with the first Battle of the Somme of 1918 having halted what had begun as an overwhelming German offensive, the second formed the central part of the Allies' advance to the Armistice of 11 November.

Battle
On 15 August 1918, Field Marshal Douglas Haig refused demands from Marshal Ferdinand Foch to continue the Amiens offensive, even though the attack was faltering as the troops outran their supplies and artillery, and German reserves were being moved to the sector. Instead, Haig began to plan for an offensive at Albert, which opened on 21 August. The main attack was launched by the British Third Army, with the United States II Corps attached.

The second battle began on 21 August with the opening of the Second Battle of Bapaume to the north of the river itself. That developed into an advance which pushed the German Second Army back over a 55 kilometre front, from south of Douai to La Fère, south of Saint-Quentin, Aisne. Albert was captured in 22 August. On 26 August, the British First Army widened the attack by another twelve kilometres, sometimes called the Second Battle of Arras. Bapaume fell on 29 August. The Australian Corps crossed the Somme River on the night of 31 August, and broke the German lines at the Battle of Mont St. Quentin and the Battle of Péronne. The British Fourth Army's commander, General Henry Rawlinson, described the Australian advances of 31 August – 4 September as the greatest military achievement of the war.

On the morning of 2 September, after a heavy battle, the Canadian Corps seized control of the Drocourt-Quéant‎ line (representing the west edge of the Hindenburg Line). The battle was fought by the Canadian 1st Division, 4th Division, and by the British 52nd Division. Heavy German casualties were inflicted, and the Canadians also captured more than 6,000 unwounded prisoners. Canada's losses amounted to 5,600. By noon that day the German commander, Erich Ludendorff, had decided to withdraw behind the Canal du Nord.

By 2 September, the Germans had been forced back to the Hindenburg Line, from which they had launched their offensive in the spring.

On their way to the Hindenburg Line, in a fierce battle, the Canadian troops, led by General Sir Arthur Currie, overcame the earthworks of the incomplete Canal du Nord during the Battle of Canal du Nord.

In late September/early October, one of the epic battles of the whole war was the breach of the Hindenburg Line (the Battle of St. Quentin Canal) by Australian and American troops (under the command of Australian General John Monash). Soon after, the Canadians breached the Hindenburg Line at the Battle of Cambrai.

A key part of the German supply line ran parallel with the front. This second 1918 battle around the Somme was part of a strategy designed to push parts of the German line back behind this main supply line so cutting it and making the efficient maintenance of the German forces on the front, impossible. The campaign began with battle of Bapaume and, starting shortly after, the Battle of Saint-Mihiel, outside the Somme area, with the aim of reducing salients before using the fluidity of the broken line to press on to the strategic railway. It was hoped that this fluidity would be present as, owing to the German advance in the spring, the German forces were well in advance of their hitherto impregnable, very well prepared defences on the Hindenburg Line.

This policy worked but it took some very determined work at the St. Quentin Canal, among the prepared defences, to achieve success.