Spring Offensive, Hundred Days and Armistice
A Race Against Time
By spring 1918 Germany’s strategic position was paradoxical. On the surface it had never looked stronger. The Treaty of Brest-Litovsk in March 1918 had ended the Eastern Front and freed around 50 divisions for the Western Front. The U-boat campaign had not yet been decisively beaten. Below the surface things were grim. The British naval blockade had reduced the home front to near-starvation. Industrial output was falling. The American Expeditionary Force was building rapidly in France — around 250,000 American soldiers were arriving every month by mid-1918. Ludendorff knew that if he did not win the war by summer, he would not win it at all.
Operation Michael, the first phase of the German Spring Offensive, opened on 21 March 1918 with the largest artillery barrage of the war — 6,600 guns fired over a million shells in five hours. Using stormtrooper tactics, German troops advanced up to 65 kilometres in a week — the largest gain by either side since 1914.
The Spring Offensive Runs Out of Steam
Ludendorff launched five separate offensives between March and July 1918: Michael (Somme), Georgette (Lys), Blücher (Aisne), Gneisenau (Matz) and Friedensturm (Marne). The opening blows shocked the British Fifth Army into the longest retreat of the war. In response, on 26 March 1918 the Allies appointed French general Ferdinand Foch as Generalissimo — a single allied commander coordinating all forces. When the second offensive struck in Flanders, Haig issued his famous ‘backs to the wall’ order on 11 April. Allied unity, scrambled into being by crisis, was Germany’s most important new enemy.
Then the offensive began to fail. The reasons were structural. Stormtrooper tactics had no follow-through — once the lead infiltrators ran ahead of their supplies, they could not be reinforced. The advance overran territory but missed strategic objectives like the railway hub at Amiens. German losses were heavy: about a million casualties between March and July, including the elite stormtrooper divisions Ludendorff could not replace. By July, Germany had simply burned through its strategic reserve. The Friedensturm offensive on the Marne was met by a coordinated French and American counter-attack on 18 July 1918, marking the end of the German initiative.
Stormtroopers carried light weapons (sub-machine guns, grenades, flamethrowers) and were trained to flow around enemy strongpoints rather than attack them head-on. The tactics were brilliant at tactical breakthrough — they gave Germany the largest single-day gains of the war. But infiltration outran logistics. The German army still moved supplies, reserves and artillery by horse and foot, while the British and French had pre-prepared rail-supplied defensive zones. Each offensive opened spectacularly, then ran out of steam in days. Ludendorff also failed to choose strategic objectives consistently: Michael advanced into open country instead of seizing Amiens. Tactical brilliance without strategic focus produced gains that could not be held.
The Hundred Days
On 8 August 1918 the Allies launched the counter-offensive that became known as the Hundred Days. The opening attack at Amiens combined every tool the BEF had developed: 552 tanks, predicted artillery fire (no preliminary bombardment to give warning), 800 aircraft, sound-ranging to silence German guns, infantry trained in platoon tactics. The German army broke. Ludendorff called it ‘the black day of the German army’. Eight miles were taken in a day.
The Hundred Days were not one battle but a sustained advance of carefully prepared Allied operations — Amiens, the Hindenburg Line breakthrough at the Canal du Nord (27 September), the Battle of St Quentin Canal (29 September), and the Battle of the Sambre on 4 November. The combination was devastating: combined-arms attacks each rotated along the front so no single sector took permanent strain, supported by overwhelming American manpower (over a million troops in the line by autumn 1918) and dwindling German reserves. The combined-arms approach forged through 1915–17 was now winning the war.
Five interlocking factors broke Germany in 1918: failed Spring Offensive (manpower exhaustion); American manpower (~250,000/month arriving); the Allied combined-arms learning curve; the British naval blockade; and German internal collapse (Kiel mutiny, abdication). No single factor was sufficient on its own.
Internal Collapse
By autumn 1918 the German home front was breaking. The blockade had killed roughly 750,000 civilians and pushed urban populations to the edge. Germany’s allies collapsed in succession — Bulgaria signed an armistice on 29 September 1918, the Ottoman Empire on 30 October, Austria-Hungary on 3 November. In late October the German High Seas Fleet was ordered to make a final sortie against the Royal Navy; crews at Wilhelmshaven refused, and on 3 November sailors at Kiel mutinied. The mutiny spread inland in days. Workers’ councils took control in Munich and other cities.
Ludendorff resigned on 26 October 1918. Kaiser Wilhelm II abdicated on 9 November 1918, fleeing to the Netherlands. A new German republican government, hastily declared, sent representatives to a railway carriage in the Forest of Compiègne, where French Marshal Foch presented terms. The armistice was signed at 5am on 11 November 1918 and took effect at 11am that morning — ending the fighting at the eleventh hour of the eleventh day of the eleventh month.
In the Hundred Days the BEF inflicted defeats on the German army that few other forces achieved in the entire war. Roughly 188,000 German prisoners were taken between August and November 1918 by British and Empire troops alone. Foch’s strategic coordination as Allied Generalissimo from late March 1918 ensured the Allies attacked Germany at multiple points simultaneously, never letting reserves rest. Revisionist historians (Sheffield, Simkins, Todman) argue these victories should weigh against the ‘butcher and bungler’ verdicts that dominate popular memory. The most balanced view: Haig and Foch presided over a force that had learned its trade through hard losses and finished the war as the most effective fighting army in the world.
Significance
November 1918 ended fifty-one months of fighting that had killed around 9 million soldiers and shaped the rest of the twentieth century. The German army had been beaten on the battlefield, but no Allied soldier had set foot on German soil — a fact that allowed the post-war ‘stab-in-the-back’ myth to take hold. The combination of factors that produced the armistice cuts directly across single-cause explanations. America’s manpower mattered, but only because it arrived in time and the Allies held long enough. The blockade mattered, but only because Jutland kept the High Seas Fleet bottled up. Generalship mattered, but only with the combined-arms toolkit forged through 1915–17. Internal German collapse mattered, but it was triggered by military defeat in the field. Top-band essays weigh these factors together, with judgement and evidence, rather than picking one alone.